The real problem with tiktok is not the CCP; it seems likely in my mind that our own government has equally nefarious techniques at play in other countries, and I think its unfair to single out a single company over this or any other behavior that is otherwise legal.
So cut them off at the knees—make the behavior of tiktok illegal, for them and for any other of the thousands of companies doing basically the same thing. Pointedly i mean the extra-application data collection, cross-checking with third-party data miners (which should be illegal already), and the sorts of things we've just become accustomed to being par for the course.