"Our community of 100 million U.S. users love TikTok because it's a home for entertainment, self-expression and connection, and we're committed to protecting their privacy," the spokesperson said. "We will continue to challenge the unjust executive order, which was enacted without due process and threatens to deprive the American people and small businesses across the U.S. of a significant platform for both a voice and livelihoods."

Vanessa Pappas, the interim head of TikTok, said on Twitter Friday that this type of ban would be bad for the industry and invited Facebook and Instagram to publicly join its challenge and support their litigation against the Trump administration.

"This is a moment to put aside our competition and focus on core principles like freedom of expression and due process of law," she wrote.

TikTok said that in its proposal to the U.S. it's committed to "unprecedented levels of additional transparency and accountability well beyond what other apps are willing to do, including third-party audits, verification of code security, and U.S. government oversight of U.S. data security. Plus, an American technology provider would be responsible for maintaining and operating the TikTok network in the U.S., which would include all services and data serving U.S. consumers.

TikTok's disappearance from Apple's U.S. app store and Google Play would mean that users would lose out on any security updates, general updates or maintenance for the app. That's benign enough, except that users can be targeted by bad actors through any unpatched security vulnerabilities in the future.

"An abandoned app that is no longer available from the respective app store is an app that can no longer be updated to address bugs or vulnerabilities," cloud security company Wandera wrote in a recent report. "This means they are now in a prime position to be exploited by hackers, offering fake updates, or targeting known vulnerabilities that were never patched."

TikTok ranks fourth among free apps offered in Apple's U.S. app store. Data analytics firm Sensor Tower said it sees no evidence the news has caused a rush on installs, though there's plenty of anecdotal data showing increased interest.

Sensor Tower reported that the threat of Tiktok's ban resulted in a spike of downloads for its competitors in July. TikTok's monthly active users have grown across the U.S. app store and in Google Play by 51% from January to August, and increased slightly since June despite the threat of the ban.