However, there is no restriction on accessing regular youtube if you are child or a parent.

The vast majority of all restrictions on a child’s behavior are simply enforced by their parents.

That’s the point. That used to be enough. Now just giving your child access to a computer could seriously tamper with their mental health

By the way, is there any evidence of this? Or are such claims perhaps similar to how old people never understood new things and claimed that "punk rock and heavy metal could seriously tamper with kids' mental health"?