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?

Right, but in this case, the parental controls just wouldn't be doing their job. I mean, you're right—there's nothing you can do about that. But if I'm turning on a setting to enable a parental control and it doesn't enable the parental control, then I'm 1) complaining about Microslop in the case of Windows, or 2) switching my kids to a different distro in the case of Linux. Again, I'm against the idea of government-mandated on the OS side. I'm undecided on the website side of things.

I'm gonna transcribe a section of a comment I made in another post:

Upon setting up the device or account, it is the parent's responsibility to create a password or biometric or whatever to activate/deactivate the safety mode. No personal information required. It should be pretty easy. Are there technically ways for the kid to get around this? Yes, but that'd be breaking the trust. In the same way you'd deal with your kid sneaking out of the house, you deal with that separately. | https://programming.dev/comment/22589550

I'd be in favour of the government commissioning and funding this and making it free-to-access for parents.

That's interesting. I'm in America and, unless it's FOSS, I definitely 100% do not trust a government-commissioned application that needs to see and manage all of my home's network traffic in order to work. Especially not right now.