Which is also a problem because we can't have adult spaces either. Every time someone tries, they get shut down or all attempts to keep kids out are fruitless. At this point I think everyone would benefit from robust ways of enforcing age limits online.
Personally I think this needs to be at the device level. You can register a device as: child, teen, adult. Every website can query the device age group. The device age is set by a process that verifies ID through a trusted party. Only that party knows your identity, everyone else simply knows your age group. Child and teen devices would be tied to an adult account and only they could override or update the classification (or a valid adult ID works too).
Then it would put liability on the parent for allowing their kids access to adult content. Websites not checking for this info that abuse it can be shut down.
Not the environment, the parks. I get those are basically the same thing to us, but not to them.