Kind of like Aqua said, China controls kids time on computers, social media, games etc. They require uploading an official ID to sign up for an app, use facial recognition, etc. to identify users quite quickly. Ther are also huge fines for the gaming companies, social media companies if they break this rule.
In addition, the equivalant of Tik Tok bans "prank" videos, or even those that are taken in entertainment places where kids should not be (karaoke parlors, dance clubs, etc.)