This is by far the best solution and should be the top comment.

Why is the onus on the parents to chase after their kids - screen time is awful and kids get around it.

The social media and porn sites should be penalized and the onus should be on them. Just like when we were kids, the channel couldn't show certain content like nudity and cursing or they'd be fined.

How is it suddenly the obligation of the parent to supervise a million options with horrible interfaces.