[skybrian]

The idea is that society should have some common standards for what's inappropriate for children. For example, parents don't want their kids to buy cigarettes, but also, stores don't want to sell them cigarettes. When there's consensus on this, cooperation is possible. Parents have an easier time when they get cooperation from the rest of society.

But there isn't going to be consensus on everything, so content filters are still needed.

[iamnothere]

So simple, just get various Christian, Muslim, atheist, traditionalist and progressive, sane and insane parents to all agree on a common set of what is appropriate and inappropriate. And then enforce that on all of their children. Why didn’t I think of that? That should go great.

[popcornricecake]

It's the internet. There are no borders and there is no mandate to follow any consensus. Stores may not want to sell cigarettes to children, but e-stores safely hosted in some remote country do want to sell them nicotine pouches and vapes. With a protocol that makes age information always available to websites they could hide their intentions from adults while actively targeting children.

[Ajedi32]

IMO you could have some mechanism by which websites could have content certified as child-safe if they agree to adhere to certain standards. (And thereby make them accessible to child-safe devices, which would otherwise default to blocking content which doesn't bear such a certificate.) Adult devices would not implement those restrictions and would therefore be unaffected.