Twitter Goes to War With Substack

Lon Harris
Lon Harris is a contributor to dot.LA. His work has also appeared on ScreenJunkies, RottenTomatoes and Inside Streaming.
Twitter Goes to War With Substack
Evan Xie

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Substack announced a new feature this week called “Notes,” which will allow users to publish brief posts containing a few sentences, quotes, simple reactions, images, and links. These Notes are going to get their own dedicated tab, separate from longer-form Substack content, and the basic format feels purposefully borrowed from Twitter. Individual notes can be liked, replied to, and reshared – just like tweets – and there will even be separated tabs for authors to which you’re specifically subscribed vs. content from your “extended Substack network,” similar to Twitter’s “Following” vs. “For You” structure.


In their blog post outlining the new feature, Substack co-founders Chris Best, Hamish McKenzie, and Jairaj Sethi were quick to differentiate Notes from Twitter, drawing attention specifically to their revenue model. While Twitter is free (unless you’ve just GOT TO have that blue check) and writers receive no direct financial compensation for their contributions, Substack remains subscription-based. Rather than aiming for virality for its own sake, Team Substack argues that subscriptions provide a genuine incentive for posting quality content, as Notes will help Substack authors convert “casual readers into paying subscribers.”

High-minded rhetoric aside, Substack could clearly use a hot new feature. According to newly-disclosed SEC statements, the company burned through around $25 million in cash during a major 2021 expansion, up from just $1 million in expenses the year before. For the entire year 2021, the company earned gross revenue of just $11.9 million, mostly from its share of blog subscriptions. (2022 data is currently unavailable.)

Despite the obvious aesthetic similarities between Notes and Twitter, and Substack’s very overt attempts to lure away Twitter users, they seem likely to remain different kinds of platforms. In large part because so much of the power of Twitter is in its wide-open accessibility to all. Though a small percentage of overall users drive most of Twitter’s activity and engagement, they’re not always the same people who could attract massive paid followings on a platform like Substack. It remains to be seen whether a subscription-based platform can drive conversations and generate the kinds of breakout viral moments that have made Twitter feel essential.

Nonetheless, Twitter seems to view Notes as a threat. Within 24 hours of the feature’s announcement, the social network and microblogging service began scaling back interactivity with Substack. At first, Substack writers were just unable to embed tweets in their posts, but now, Twitter has blocked all likes, retweets and comments on any links pointing back to a Substack newsletter. As well, Twitter users can’t link to a Substack blog via their profile, making it essentially impossible to use your Twitter account to promote a paid Substack blog. (At least for now, you can apparently still get around these changes with a URL shortener. But you didn’t hear that from us…)

Asked about the controversy by The Verge, Substack’s trio of founders used Twitter’s moves as further ammunition, pointing out that it’s dangerous for writers to rely on a platform on which “they don’t own their relationship with their audience” and “where the rules can change on a whim.”

Beyond just bolstering a key argument in favor of its competitor, Twitter’s decision to go to war with Substack pretty clearly makes its own platform worse. By removing the incentive of promoting work for which they actually get paid, it seems likely that this move will discourage some active users – who, again, drive the bulk of Twitter’s traffic and engagement – from tweeting as much. Tellingly, the Substack purge even removed some links to Matt Taibbi’s “Twitter Files” reporting, produced in coordination with Twitter and its owner, Elon Musk.

As well, Twitter’s prominence is largely based around being at the center of so much online conversation and discourse. By removing the ability of Substack writers to refer back to tweets, Twitter is purposefully taking itself out of a lot of these discussions. If you make it significantly harder for writers to talk about tweets… they might actually stop talking about tweets. Which would be far worse for Twitter, overall, than just the presence of a new competitor, which may not actually be a direct competitor anyway.

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Netflix Doubles Down on LA

🔦 Spotlight

Hey Los Angeles.

Goodbye Coachella, hello Stagecoach. The desert doesn’t stay quiet for long, and neither does LA’s entertainment machine.

This week, that momentum showed up in a more permanent way.

Netflix is expanding its footprint in Los Angeles with a major move to take over and invest in Radford Studio Center, a historic production lot in Studio City. The company is planning a long-term transformation of the site, with upgrades to soundstages, production offices, and infrastructure designed to support the next generation of film and television production.

It’s a notable shift in a moment when production has been under pressure in California, with studios increasingly looking outside the state for cost advantages. Netflix going deeper in LA, and specifically into a legacy studio lot, signals a different kind of commitment. Not just to content, but to where that content actually gets made.

And it comes at a time when the streaming wars have matured. Growth is harder, budgets are tighter, and the focus has shifted from scale at all costs to efficiency and control. Owning or operating more of the production environment gives Netflix tighter control over timelines, costs, and output.

For Los Angeles, it’s a reminder of what still anchors the city. Even as AI, defense tech, and infrastructure startups continue to rise, entertainment remains one of the few industries where LA isn’t just competitive, it’s foundational.

Different headlines each week, but a consistent theme underneath them. Whether it’s power, autonomy, or content, the companies that matter are investing in the layers they don’t want to outsource.

And in this case, that layer is Hollywood itself.

Below are this week’s venture deals, fund announcements, and acquisitions across LA 👇


🤝 Venture Deals

    LA Venture Funds

    • UP Partners and Calm Ventures participated in Reliable Robotics’ $160M funding round, backing the autonomous aviation company as it advances pilotless flight technology for cargo and passenger aircraft. The round included a mix of new and existing investors, and the company plans to use the capital to accelerate certification efforts and expand deployment of its autonomous systems across commercial aviation. - learn more
    • Blue Heron Ventures participated in Tava Health’s $40M Series C, backing the company as it expands its tech-enabled mental health platform into a more integrated, full-stack system for providers, employers, and health plans. The round was led by Centana Growth Partners with participation from existing investors, and the company plans to use the funding to roll out new AI-powered tools and broaden access to care while reducing administrative friction across the system. - learn more
    • Vamos Ventures participated in Zócalo Health’s $15M Series A, backing the company as it scales its tech-enabled, community-based primary care model focused on high-need and underserved populations. The round was led by .406 Ventures with participation from existing and new investors, and the company plans to use the funding to expand its clinics and deepen partnerships with Medicaid programs as demand for accessible care grows. - learn more

    LA Exits
    • Studio71 has been acquired by Fixated as part of a broader deal in which German media company ProSiebenSat.1 sold its North American creator business, giving Fixated a large-scale network of creators and podcast operations and significantly expanding its footprint as it continues an aggressive roll-up strategy in the creator economy. The move signals continued consolidation in the space, with Fixated building a more vertically integrated platform across talent management, content production, and distribution. - learn more
    • Bonsai Health has been acquired by ModMed, bringing its AI-powered patient engagement platform into a broader healthcare software ecosystem. The deal is aimed at integrating Bonsai’s “agentic AI” capabilities into ModMed’s platform to automate patient outreach, fill care gaps, and improve scheduling across a network of nearly 50,000 providers. - learn more

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      A $26M Push Into Power in LA

      🔦 Spotlight

      Hello, Los Angeles.

      Coachella Weekend 2 is here, which usually means LA is either heading back to the desert or happily staying put this time around. Back in the city, the focus this week is less about music infrastructure and more about something far more critical, power.

      That’s where this week’s news comes in.

      Critical Loop, a Los Angeles-based energy startup, raised a $26 million Series A to tackle one of the least talked about bottlenecks in tech right now, grid interconnection. In simple terms, it’s the process of getting power to where it’s needed, and increasingly, that process is too slow to keep up.

      Critical Loop is building modular microgrid systems that can be deployed in days instead of years, giving industrial operators, data centers, and other energy-heavy users faster access to power without waiting on traditional grid upgrades. The round was led by Conifer Infrastructure Partners and Hanover, with participation from Better Ventures, Climate Capital, Adapt Nation Capital, and Cyrus Ventures.

      The timing here matters. Between AI infrastructure demands, electrification, and a broader push toward domestic energy resilience, power is quickly becoming a gating factor for growth. You can build the data center, the factory, or the next big thing, but none of it works if you can’t turn it on.

      That’s what makes companies like Critical Loop worth watching. They’re not building the flashiest part of the stack, but they’re solving for the piece everything else depends on.

      And in a city that knows a thing or two about scaling ambition quickly, that might be the most important layer of all.

      Below are this week’s fund announcements across LA 👇


      🤝 Venture Deals

      LA Venture Funds

      • Anthos Capital participated in Wealth.com’s $65M Series B, backing the AI-powered estate and tax planning platform as it scales across financial institutions. The oversubscribed round included new investors like Titanium Ventures and Pruven Capital alongside existing backers, and the company plans to use the funding to expand product development, pursue acquisitions, and grow its enterprise footprint as demand rises for AI-driven wealth management solutions. - learn more
      • Anamika Ventures participated in Sage Haven’s $3M pre-seed round, backing the AI-powered messaging and calling app designed to create a safer communication environment for kids. The round was led by Anamika Ventures alongside Fabric Ventures and a group of early-stage investors, as the company launches a platform focused on preventing cyberbullying through real-time AI moderation and parent oversight tools. - learn more
      • MANTIS Venture Capital participated in Factory’s $150M Series C, backing the AI startup as it builds autonomous software engineering systems for enterprise teams. The round was led by Khosla Ventures and included firms like Sequoia Capital, Blackstone, Insight Partners, and NEA, valuing the company at $1.5 billion. Factory plans to use the funding to invest further in product development and global expansion as demand grows for AI-driven tools that can automate large portions of the software development process. - learn more
      • Rebel Fund participated in Uplane’s $4.5M seed round, backing the AI startup as it looks to replace traditional marketing agencies with a platform that automates ad creation, testing, and budget optimization. The round was led by Play Ventures with participation from Y Combinator, 20VC, and Multimodal Ventures, and the company says its technology can improve return on ad spend by automating performance marketing workflows. - learn more
      • Alexandria Venture Investments and Presight Capital participated in Alloy Therapeutics’ $40M Series E, backing the biotech infrastructure company as it scales its AI-powered platform for drug discovery and development. The round included a mix of new investors like 8VC and JIC Venture Growth Investments alongside returning backers, valuing the company at $1 billion and underscoring continued interest in platforms that combine AI, data, and lab services across the biopharma lifecycle. - learn more
      • Finality Capital Partners participated in HYFIX’s $15M seed round, backing the semiconductor startup as it builds American-made chips designed to power drones and autonomous robots. The round was led by Craft Ventures with participation from Catapult Ventures, Multicoin Capital, and Sky Dayton, and the company is developing an integrated system-on-a-chip to replace fragmented hardware stacks and reduce reliance on foreign components. - learn more
      • Rainfall Ventures participated in Stendr’s $5.4M pre-seed round, backing the Norwegian defense tech startup as it builds an AI-native platform for drone detection and counter-drone operations. The round was co-led by Rainfall alongside ACME Capital and Skyfall, with additional participation from Antler, StartupLab, and other early-stage investors, and the company plans to use the funding to accelerate development of its multi-sensor technology and expand engineering capabilities. - learn more
      • Slauson & Co. participated in Slate Auto’s $650M funding round, backing the EV startup as it works to bring a lower-cost electric pickup truck to market. The round was led by TWG Global and comes as the Bezos-backed company prepares to begin production, targeting a more affordable segment of the EV market with a customizable truck expected to launch later this year. - learn more
      • Navitas Capital co-led Primepoint’s $10M seed round, backing the AI startup as it builds a platform that reads and connects complex construction drawings to streamline project workflows. The round also included investors like Penny Jar Capital, NextView Ventures, GS Futures, and Aglaé Ventures, and the company plans to use the funding to expand its platform and grow adoption among large commercial contractors. - learn more
      • Alexandria Venture Investments participated in Neomorph’s $100M Series B, backing the biotech company as it advances its molecular glue degrader platform targeting previously undruggable diseases. The round was led by Deerfield Management with participation from Regeneron Ventures, Longwood Fund, and Binney Street Capital, and the company plans to use the funding to support ongoing clinical trials and expand its broader drug development pipeline. - learn more

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      Hermeus Moves In. Uber Lines Up. LA Wins.

      🔦 Spotlight

      Hello, Los Angeles.

      This week’s transportation news says a lot about where LA is headed and who wants to build here.

      Start with Hermeus, which hit a $1 billion valuation after raising $350 million as it works on high-speed aircraft for defense applications. More notably for Los Angeles, the company is moving its headquarters to El Segundo, adding to the region’s growing aerospace and defense cluster. The round was led by Khosla Ventures, with participation from returning backers including Canaan Partners, Founders Fund, RTX Ventures, Bling Capital, and In-Q-Tel, along with new investors including Cox Enterprises, Socium Ventures, Destiny Tech100, Georgia Tech Foundation, 137 Ventures, and GSBackers.

      Then there’s Uber, which made two separate autonomous vehicle announcements that both put Los Angeles in the rollout map.

      The first is a partnership with Zoox, Amazon’s autonomous vehicle company. Uber said the service is expected to launch in Las Vegas in summer 2026 and then come to Los Angeles by mid-2027, giving riders the option to match with a Zoox robotaxi through the Uber app.

      The second is a new deal with MOIA America, which plans to deploy autonomous ID. Buzz vehicles on the Uber platform in Los Angeles by the end of 2026.

      Taken together, the message is pretty straightforward: LA is not just watching the future of transportation take shape, it is increasingly being used as the place to test it, scale it, and sell it. Hermeus is bringing its headquarters here as defense aviation regains momentum. Uber is lining up autonomous partners with Los Angeles as a target market. Different companies, different timelines, same conclusion: a meaningful share of the next transportation cycle is being built with LA in mind.

      Below are this week’s venture deals, fund announcements, and acquisitions across LA.


      🤝 Venture Deals

      LA Companies
      • PeakMetrics raised a $6M Series A to scale its AI-powered narrative intelligence platform, which helps organizations track how information spreads online and identify risks from misinformation and coordinated campaigns. The round was led by Moneta Ventures with participation from Techstars, Parameter Ventures, VITALIZE Venture Capital, and Gurtin Ventures, and the company plans to use the funding to enhance its real-time detection capabilities and expand adoption across enterprise and government customers. - learn more
      • Hybron raised a $25M seed round to scale its advanced carbon fiber composite manufacturing technology, which aims to produce high-performance components faster and at lower cost than traditional methods. The round was led by Marque Ventures with participation from a mix of venture firms and strategic investors, and the company plans to use the funding to expand manufacturing capacity, grow its team, and support increasing demand from aerospace and defense programs. - learn more

      LA Venture Funds

      • Emmeline Ventures participated in Osteoboost’s $8M funding round, backing the company as it expands access to its FDA-cleared wearable designed to treat low bone density in postmenopausal women. The round was led by Ambit Health Ventures with participation from Disrupt Health Impact Fund and others, and the company plans to use the capital to scale manufacturing, expand clinical research, and grow commercial adoption. - learn more
      • Bonfire Ventures led Juno’s $12M seed round, backing the AI-powered tax preparation platform as it aims to automate up to 90% of the manual work in tax filing for accounting firms. The round included participation from Impression Ventures and Xfund, and the company says its software can significantly reduce preparation time while keeping CPAs in the loop for review and advisory work. - learn more
      • Alexandria Venture Investments participated in Sidewinder Therapeutics’ $137M Series B, which will help fund the company’s push to bring its precision bispecific ADC cancer programs into the clinic. The round was co-led by Frazier Life Sciences and Novartis Venture Fund, and Sidewinder said it expects to advance its lead program into clinical development in 2027. - learn more
      • Slauson & Co. participated in Flora Fertility’s $5M seed round, backing the company as it builds what it describes as an individually owned fertility insurance platform that is not tied to an employer. The round was led by ManchesterStory, and Flora plans to use the funding to scale a model aimed at making fertility coverage more portable and accessible for consumers. - learn more
      • Mucker Capital participated in Fastrflow’s $375K early funding round, backing the startup as it builds a screen-aware AI copilot designed to assist students and professionals directly within their workflows. The company is focused on creating an assistant that can understand what’s on a user’s screen in real time to provide contextual help, positioning itself as a more integrated alternative to traditional standalone AI tools. - learn more

      LA Exits

      • Modern Animal has been acquired by Chewy, giving the pet e-commerce giant a much bigger physical veterinary footprint as it expands deeper into healthcare. The deal brings Chewy an additional 29 clinics, 24/7 virtual care, and a membership-based model, and is expected to grow Chewy Vet Care from 18 to 47 locations nationwide while adding more than $125 million in annualized run-rate revenue. - learn more
      • Honk has been acquired by Frontenac, with the Los Angeles roadside assistance software company simultaneously completing an add-on acquisition of CurbsideSOS as part of the deal. The combination is meant to scale Honk’s platform for roadside assistance, towing, and accident management, with former Grubhub executives including Adam DeWitt, Matt Maloney, and Eric Ferguson joining the company to lead its next phase of growth. - learn more

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