There's nothing that can't be worked around or compromised in some way. Even the face scans and ID scans being used today are being circumvented.
In the end we do need parents to parent, but websites should help. The easiest way would be for websites to send an HTTP header to the client so that censorware can know to block or allow it accordingly.
> The easiest way would be for websites to send an HTTP header to the client so that censorware can know to block or allow it accordingly.
That sounds very similar to the suggestion of the original commenter, that you responded to with
>> That just entertains the false justification for what is ultimately about surveillance and control.
The header must confirm that site is age-appropriate. No header should be interpreted as "adults only". This is the safest option, and it doesn't require 99% of webmasters to do anything which is in my opinion better than any other proposal.