Then we have systems like:
PICS https://en.wikipedia.org/wiki/Platform_for_Internet_Content_...
POWDER https://en.wikipedia.org/wiki/Protocol_for_Web_Description_R...
ASACP/RTA https://en.wikipedia.org/wiki/Association_of_Sites_Advocatin...
Proving we do not need a system prone to PII leaks, just collaboration between content providers and guardians, helped by OS & browser vendors.
But it seems restricting minors is a side effect, at best, of the on going theatre.