In Holland there's even ISPs that filter porn and stuff, like https://kliksafe.nl . They're used by ultra-religious conservative communities (calvinists). Even adults use it there.
I view this as a much better solution. The people that want it can do their blocking and the rest of us aren't bothered with verifications and stuff.
Personally I belong to the sex-positive movement which thinks diametrically opposite about such matters :)
You will loose this argument because there is a real problem with children and AI slop. Especially because there is a problem with AI slop and handling it by people in general.
Provide a solution which doesn’t require that, like some other top commenter did. Otherwise, you have already lost.
It’s ID verification.