>but TikTok especially.

Not really. All of your points about Chinese access to data are also true with respect to Twitter. Binance, a shady Chinese crypto company, invested heavily in Musk's Twitter acquisition and has a $500 million stake in the country. Twitter has an agreement to hand over unspecified private data to investors who contributed $250 million or more to support Musk's acquisition. For all we know, the Chinese government has access to all of the data on Twitter's servers dating back over a decade. It's a far greater national security threat given how prevalent Twitter is and has been among elected officials.