I think we're all going to get used to making this argument about tarrifs, so we might as well start now:

The US government can't ban foreign companies from competing with companies in the US. It can only ban Americans from buying from foreign companies. Framed like that, do you still want China's ban on Chinese citizen's use of global information adopted to limit your own access to it?

Selling a reduction in your own rights as the use of force on a foreign entity has to be one of the clearest instances of closing on "please take my freedoms away" of all time.

That first part about Douyin, sounds exactly like what the internet should be, a public resource for learning about hard things.

The second part, well, I guess I can read a book, and maybe children should, too.

Maybe there's child accounts that has those limits, but normal accounts don't match that description. I've watched my girlfriend use Douyin and the content was lower brow than what e.g. Instagram shows her. It was mostly dumb skits and people doing silly dances. Due to time zones, I have no clue if it shut down at night, but it never seemed to be an issue.

We get a lot of propaganda about Chinese social media apps that's just wrong. I was told Xiaohongshu is a propaganda app that sends quotes from Mao's little red book, and it's Chinese Instagram.