TikTok Sues to Stop "Forced Shutdown" in US
No Constitutional Protections
Second, if its Chinese, then it definitely has no protections in the USA. Free Speech or otherwise.
Finally, they can either divest and sell, like they force American companies to do, or they can pull out of the largest market. At the end of the day none of us care, because American companies will create another version of TicTok anyway.