Maybe I needed to say "it merely requires the existence ...". Because I then do go on to say:

> And they are only required on the devices actually given to kids

My whole point is that this limits the blast radius, compared to any solution involving "age" (read: identity) verification which has a blast radius of every computing device!

Perhaps my other comment will show you where I'm coming from better: https://news.ycombinator.com/item?id=48645646