TikTok loses Supreme Court fight, prepares to shut down Sunday

Further, the government was right to single TikTok out, SCOTUS wrote, due to its "scale and susceptibility to foreign adversary control, together with the vast swaths of sensitive data the platform collects."

"Preventing China from collecting vast amounts of sensitive data from 170 million US TikTok users" is a "decidedly content agnostic" rationale, justices wrote.

"The Government had good reason to single out TikTok for special treatment," the opinion said.

Momentum to ban TikTok has shifted

First Amendment advocates condemned the SCOTUS ruling. The American Civil Liberties Union called it a "major blow to freedom of expression online," and the Electronic Frontier Foundation's civil liberties director David Greene accused justices of sweeping "past the undisputed content-based justification for the law" to "rule only based on the shaky data privacy concerns."

While the SCOTUS ruling was unanimous, justice Sonia Sotomayor said that  "precedent leaves no doubt" that the law implicated the First Amendment and "plainly" imposed a burden on any US company that distributes TikTok's speech and any content creator who preferred TikTok as a publisher of their speech.

Similarly concerned was justice Neil Gorsuch, who wrote in his concurring opinion that he harbors "serious reservations about whether the law before us is 'content neutral' and thus escapes 'strict scrutiny.'" Gorsuch also said he didn't know "whether this law will succeed in achieving its ends."

"But the question we face today is not the law’s wisdom, only its constitutionality," Gorsuch wrote. "Given just a handful of days after oral argument to issue an opinion, I cannot profess the kind of certainty I would like to have about the arguments and record before us. All I can say is that, at this time and under these constraints, the problem appears real and the response to it not unconstitutional."

For TikTok and content creators defending the app, the stakes were incredibly high. TikTok repeatedly denied there was any evidence of spying and warned that enforcing the law would allow the government to unlawfully impose "a massive and unprecedented speech restriction."

But the Supreme Court declined to order a preliminary injunction to block the law until Trump took office, instead deciding to rush through oral arguments and reach a decision prior to the law's enforcement deadline. Now TikTok has little recourse if it wishes to maintain US operations, as justices suggested during the trial that even if a president chose to not enforce the law, providing access to TikTok or enabling updates could be viewed as too risky for app stores or other distributors.