Again, this is not a new concept. The Montana ban was stopped but even in that case, AFAIK the appeal isn’t settled. This was also not something heard by the Montana supreme court or the US supreme court.
The national ban has also presumably been crafted by much more experienced lawyers and lawmakers than the Montana ban. Presumably folks that understand the law better than either of us.
IMO comparing a TikTok ban to some major infringement even remotely close to an authoritarian country … it’s just wrong. Freedom of association has its limits and always has. Associating with a hostile foreign power, for instance the confederate states, was not ever to my knowledge protected. The only entity that folks are being prevented from associating with here is the Chinese government.
Calling a TikTok ban an assault on the right of association is like calling Twitter moderation an assault on the right of free speech. There are other options available. Your argument would be much stronger if TikTok was a truly unique technology or platform, but it isn’t. It’s not even an original idea, it’s a ripoff of vine that (originally) added music to the videos, made them a bit longer, and generally suffers from a lot of the same issues in terms of monetization.