@kuriko For computers, the person getting the device or registering an account is adult, with no verification to be done. They might setup limitations for themselves or other users. (I think this was the usual before the current changes in some platforms.) The problem of children as property of parents is unrelated and not solvable via technical methods.

I want content warnings, but I don't feel a self-certifying checkbox is that, so I'm not selecting this here.

Generally, if we want identify verification, then we need methods that a random person can verify as private (something like paper-based voting), this is not doable with computers unless trusting the user declaring that they are who they think they are.

If politicians want to protect children, they can enforce existing laws. Maybe there would be no real problem solved by age verification if billionaires and their businesses weren't allowed to commit crimes.