Honestly I wonder if it's more than that. China has preemptively banned basically all major US social media sites (and many tech companies) to the benefit of their own local brands. Those brands are now entering the US market, and so I could see why the US might want to try and block them, although I suppose I wish social media sites were just allowed to operate in each respective country.

"In recent weeks, powerful politicians, including senators Josh Hawley and Marco Rubio and House Representative Mike Gallagher, have reiterated calls for a ban on TikTok, citing the app’s alleged bias towards anti-Israel and anti-Jewish content."

https://www.aljazeera.com/news/2023/11/10/tiktok-faces-renew...