Actually, there is a lot more. About 30% people (of USA) use TT, ~60% under 30. You guess it, they don't to look only at dance videos. Social media had become a huge source of information for a big chunk of the population.
On TT, and on most social media (SM), what you watch is mainly determined by the recommendation algorithm. This algo can hide subjects the SM can't put ad on but also subjects the they don't like and boost the one they do (shadow ban). That how you politicize SM. That about, the first thing Musk did with Twitter (after firing people).
When it's a state controlled SM, it's more like foreign interference. There is a lot of books about that. It's documented, not a secret of something. Uyghurs for example, have been a subject of ban on TikTok, shadowing it heavily.