[throwawayk7h]

device-side restrictions; improve the UX for parental restrictions and make them on-by-default for children.

When you buy a device, if you can't present ID (or the device is for a child), the vendor gives it to you in "child mode." Child mode has a whitelist/blacklist of all apps and websites that it can use. The list is set by the vendor, but modified by the federal government, state/provincial government, municipal government, school district, and parent/guardian (in that order, each overriding the previous.)

Perhaps in addition, devices in "child mode" always attach "do not show me adult content" to the HTTP headers they send to websites.