> it is a physical good that can't be cloned infinitely and distributed through many medias

And age verification can't stop that no matter what. It's solely for restricting access to websites and apps.

> No amount of server side age verification will prevent kids and teenagers from sharing stuff.

Great, now convince the politicians and the voting public of that. See how things are going. It would be better to have some system in place that protects adults' privacy and restricts some underage access. Instead of having to upload your passport to every website 5 years from now.