The bit that somewhat surprises me is the focus on TikTok, other apps are (AFAIK) capable of the exact same thing. Is the expectation that TikTok is the only app that the Chinese government have access to? this seems a bit unlikely.
And of course this doesn't touch on the companies that provide ad networks and other services to mobile applications, who have the ability to pull info from multiple apps at the same time, I've not seen any movement on banning those similarly.