US Congress likewise does not give a fuck what you think though, unless you are a US Citizen and even then you get a single vote. The US population at large has decided on this by their representative government.
So you are correct, except this was decided at literally the most fundamental level of US governance instead of on Capitol Hill.
Obligatory IANAL.
[1]: https://en.wikipedia.org/wiki/Preamble_to_the_United_States_...
[2]: https://en.wikipedia.org/wiki/Preamble_to_the_United_States_...
All that will likely change is people will slowly move to a US alternative, one that's propagandized by the US and not china. You'll still be allowed to have whatever discussions you want on there, conservative qanon theories, or anarchist calls to action. The videos will go into the NSA database instead of china's, it'll train our algorithms instead of theirs, etc. The app will now be bound by US Law, for better or for worse. But if slow moving from an app is going to crush your political belief/circle/movement, you didn't have one to begin with.