The Wall Street Journal recently published this article that I think shines a light on some major areas of concern.
“TikTok Feeds Teens a Diet of Darkness: Self-harm, sad-posting and disordered-eating videos abound on the popular app” [0]
— [0] https://www.wsj.com/articles/tiktok-feeds-teens-a-diet-of-da...
But it's obvious that European countries have a concept of freedom of speech, just one you personally don't consider valid. But like the guy said, that's just, like, your opinion, man. That concept is defined in the Universal Declaration of Human Rights and international law, as well as the EU Charter, and probably whatever individual constitutions or bodies of law each country has. It was established before the US came up with the First Amendment, which was based on existing Enlightenment philosophy.
A law this specific wouldn't even be valid I'm my country.
> AN ACT BANNING TIKTOK IN MONTANA; PROHIBITING A MOBILE APPLICATION STORE FROM OFFERING THE TIKTOK APPLICATION TO MONTANA USERS
[1] https://www.mtsu.edu/first-amendment/article/1549/right-to-r...