I do not consume TikTok, but I believe it works international?
Also I don't see the point, because there are americans saying, we should be friends with communist china and become like them. By giving those ideas more room - whenever they want, they can shape the discourse. Shape what people think what the majority thinks. (Most don't actually think much themself, but try to figure out, how to think like the group - they are the targets and their vote counts the same)
That's called free speech. Horrible, terrible ideas are given room, and we trust people to figure it out. Hell, many many Americans became vaccine skeptics because they were drawn into RFK talking points. That's dangerous too, but free speech is more important than forcing everyone to be good or have good, safe opinions
This is creating the illusion of a free speech, where people think they can listen to the other opinions, but in reality they only get to see a distorted part of it. But if you like that, I won't support banning that.
It's also pure nonsense that TikTok is somehow "misleading" the American youth. It's basically a recommendation engine. And what's the job of a recommendation engine? To give you whatever content you might be interested in. Just go to youtube and start clicking all the garbage content (if they are not censored already), you will end up with a lot of garbage in your feed. Because if you spend a lot of time watching garbage, the algorithm will think you like garbage and will push garbage onto your frontpage.
The threat is that it silently engages in manipulation, rather than something like RT or New York Times where the bias is well known ahead of time.