I misunderstood then, I’m all in favor of that approach. If mainstream manufacturers include an optional child mode then that doesn’t affect adults. I do think it’s better if the child device simply blocks adult labeled content rather than attesting that the user is a child, just to avoid leaking any information about minors. But it’s still an OK solution.
You don't have to, that's the point.
EDIT: or to rephrase, this proposal is opt-in (device attests the user is a minor) not mandatory (device is required to attest the user is an adult)
I misunderstood then, I’m all in favor of that approach. If mainstream manufacturers include an optional child mode then that doesn’t affect adults. I do think it’s better if the child device simply blocks adult labeled content rather than attesting that the user is a child, just to avoid leaking any information about minors. But it’s still an OK solution.