> In a more functional democracy we would see that mass data collection of any sort, by any company (foreign or domestic), is a national security risk.
You obviously don't mean "democracy," but some other word. We don't see mass data collection as a problem because most Americans don't care about privacy. The only reason this Tik Tok thing is even registering is because of the treat of China, which Americans do care about.
There's nothing preventing China from buying mass data from Facebook or one of the many data brokers. This is about censorship and the ability to control public narratives.