Confirmation someone is human is harder. Over some age could be accomplished with time should most of the devices and browsers children have access to were to check for RTA/adult headers and activate parental controls. It would not be solved over night thus not perfect but perfect is the enemy of good.

At the moment what we have is no good in my opinion. What we have at the moment will put the identification information of both children and adults at risk. Children can not even consent to sharing this data thus the only people that could protect them are their parents.