The bigger deal (bigger than the tracking that people usually focus on) might be how the algorithm is specifically tuned to reward dumb content in the US, compared to rewarding STEM and other educational content in China. One minute video that explains: https://www.youtube.com/watch?v=Hus9fWz0RRk Further reading: https://www.opindia.com/2022/07/tiktok-china-engineering-oth...
This isn't a choice being made by TikTok, this is due to regulations/laws in China. If the US passed laws requiring TikTok to do the same in the US, they would obviously comply.
Except for the part where that law would end up being declared unconstitutional, and rightly so. Then again, if TikTok has no US ownership, perhaps it would pass constitutional muster. 1A doesn't specifically mention US citizens or US-owned corporations, though, just that that government shall pass no laws abridging the freedom of speech, so maybe not.