I draw the line at when a third party internet-connected service is doing validation of ID. Let’s be honest though, I strongly believe such a thing isn’t possible on a FOSS operating system environment unless they could control what was bootable on the device at a firmware level, enforce signatures to ensure that you couldn’t boot something unrestricted, remove the ability to be root, and block LD_PRELOAD so signals couldn’t be faked. There’s probably more ways to circumvent that.
What I’m trying to say is real ID verification on Linux would be awfully hard to implement, and I guarantee you, nobody would put up with it. They’d fork to a version that doesn’t have it immediately as a protest. Right now, we’re considering implementing something akin to the date pickers that were ubiquitous when signing up for internet services in the early 2000s where it’s just an honor system.
The whole point is to ‘protect’ people for things they shouldn’t do but are legal for others. Porn is the common example where many (but not all) object and want to keep thair kids away. which is why an id is needed - otherwise any kid will give a false age.
The only way to do this that protects privacy is to accept that, but also parents of young children can just not give them root.