the issue with Tiktok is China, not privacy concerns
Radical suggestion: stop everyone from doing bad things.
I personally struggle understanding adults installing this app at all, and the fact that it targets mostly oblivious youngsters is pervasive.
So the thing to stop everyone from is "letting a maybe-hostile foreign power push an agenda via a software platform."
I don't think there's easy to ban behavior here.
We can easily react to American companies doing something like this, but how easy is it to go after a company which is based in another country and has been hostile towards America and American business for decades?