Do you really want China to have the social media history (secrets, likes/dislikes, usage profile) of our future leaders?
Edit: Plus if that's all it takes to blackmail someone you can probably just bribe them with money or something just as easily.
Both political parties already elect people that have sexual assault allegations against them, have done racist things, sexist things, etc. I don't think anything on Tik Tok is gonna be scandalous enough to blackmail over.
Also, what kind of credibility could anyone attach to it?
Hey TikTok claims that Person A liked video B on date C. And what proof do they have? They could already just create a bunch of fake logs like this.
I hate to break it to you, but a site like reddit is 1000000x more incriminating for anyone than tiktok is.