I totally agree with your main point but it is very wrong to equivocate the three letter agencies to the threat authoritarian governments gaining knowledge and thus power over a nation pose.
I believe TikTok is a MASSIVE threat to those running the show in the US, as it may be the most potent propaganda tool out there, and the US government has many juicy attack vectors that TikTok as a platform is perfect for attacking.
I tend to keep my feed pretty clean of stuff like that, but it does creep in every now and then, who knows how much anti-US propaganda is on the platform that I never encounter but others do (like the agencies who go looking for it, since "Public Relations" dominance is their job).