[yoz-y]

None of this is necessary. First, the only devices that actually need to be gated are cell phones.

The user agent should simply send the user’s age of the parental lock is set up and the websites required to respect this.

Parental controls and the OS should be robust enough to not let kids bypass it (e.g.: by installing a browser that skips the header, or blocking proxy websites)

Done.

Cellphones only because those are the devices kids can have on them all the time and can easily use in private unsupervised.

[HerbManic]

Never underestimate the resolve of a teenager who is being kept from something they want. And once they solve it, they will spread the word for clout.

[myaccountonhn]

The system doesn't need to be impenetrable. There might even be legitimate reasons for kids to circumvent it.