Don't get me wrong, I'm all for privacy. But between setting up the birthdate when creating my children's local account on their computers, and having to send a copy of their ID to every platform under the sun, I'd easily chose the former.
I'd even agree to a simple protocol (HTTP X-Over-18 / X-Over-21 headers?) to that.
I meant there would be no way to stop any OS from just waving users through and automatically converting their account into an 'adult account', or just asking users "Are you 18 yes/no". How many variations of Linux are there now?
More significantly, if this kind of capability becomes an expectation for your general usage OSes to have, then that’s less incentive for some company to come in and try to capitalize off of it and charge $12.99 per month, and then still have incentive to collect and sell data on which sites are being visited. I mean, you can be reasonably sure that Microsoft is gonna do that too, but that would be another reason to switch to a Linux distro that doesn’t do that.
I'd be in favour of the government commissioning and funding this and making it free-to-access for parents.