I think it’s more of a business decision. A lot of parents won’t let their kids on reddit (for good reason lol) but Tik tok actually does do an alright job of keeping age appropriate content off the platform, much tighter than most other social media sites. For my own interest I went looking for NSFW stuff on tik tok, the most intense I could find was some tame thirst traps, some national geographic style nudity (lots of discussion of adult themes, but I don’t think those are neccesarily a problem).

on any other social media site I’ve ever used, even with child mode or whatever I have been able to find beheadings and hardcore sex. That’s a pretty big selling point if you want to primarily attract children.