I don’t know why this isn’t a very simple Internet standard. The browsers on devices that have a child lock turned on could send an http header. People who have websites that are adult-only could configure their web server to check for that header and do something appropriate.
That requires cooperation, but since most adult websites don’t want children to be visiting them, cooperation shouldn’t be hard to get. Governments can pass a law and businesses can set a config flag. For uncooperative websites, child-locked devices can check a blacklist.
Then it’s up to parents to make sure their kids only have child-locked devices and for stores to not sell unlocked devices to kids. It’s never going to perfect, but it doesn’t doesn’t have to be to change community norms.
That requires cooperation, but since most adult websites don’t want children to be visiting them, cooperation shouldn’t be hard to get. Governments can pass a law and businesses can set a config flag. For uncooperative websites, child-locked devices can check a blacklist.
Then it’s up to parents to make sure their kids only have child-locked devices and for stores to not sell unlocked devices to kids. It’s never going to perfect, but it doesn’t doesn’t have to be to change community norms.