China imposes strong restrictions on the Chinese version of TikTok, see here:

https://www.technologyreview.com/2023/03/08/1069527/china-ti...

Excerpts: Douyin [Chinese version of TikTok] introduced in-app parental controls, banned underage users from appearing in livestreams, and released a “teenager mode” that only shows whitelisted content, much like YouTube Kids. In 2019, Douyin limited users in teenager mode to 40 minutes per day, accessible only between the hours of 6 a.m. and 10 p.m. Then, in 2021, it made the use of teenager mode mandatory for users under 14.