That don’t really work because this isn’t a nation state level enforced system, and realistically the only state that can force such a thing is the US. If they worked, we wouldn’t be here having this discussion.

... that don't need the identity of the parents to work.

Nor do these devices require the identity of non-parents who will never enable the childproofing mode

Nor does legislation invert the burden of proof and require the device's manufacturer obtain and store identity documents just to use the devices, otherwise it must restrict all access to a small handful of "kid safe" actions.

These aren't "child safety" laws, they're "adult anonymity eradication" laws