I dont like the US any more than the next guy, but lets not deny the massive political influence tiktok has on hundreds of millions of people, especially young people that are still building their opinions of the world. Same with all social media ofc but tiktok is probably the biggest and most engaged one of them at the moment.
Also (almost) nothing on the Internet is built with verifiability or true security in mind. It is absurdly simple to ruin someones life just by hijacking a social media account or depositing some incriminating files on someone elses computer if you somehow get access to it. The Internet is a technical test playground that for some reason was turned into a space that peoples livelihoods depend on.
Yeah the last part is probably the only good solution, albeit not the most realistic. De-commercializing large parts of the internet again would be a big step in the right direction.