I don’t use TikTok so please excuse my ignorance. Is the platform (allegedly) a national security threat because it’s a major vector for foreign state disinform

I don’t use TikTok so please excuse my ignorance. Is the platform (allegedly) a national security threat because it’s a major vector for foreign state disinformation (similar to Facebook, Twitter and Reddit) or because it’s a vector of foreign state information gathering/spying?