I believe it is necessary to implement this at the OS level. This has been needed for a long time, because the “goodwill” approach never works.

The introduction of age verification is something that was to be expected with the growth in the use of the web, rather than individual programs. But there are a bunch of ways to get around it, which you do, but no one will punish you. This way, you will have parental control and transfer it to the website, while facilitating control over minors' access to unwanted content. And this way, websites do not need to implement their own terrible age verification methods. And when people complain that this is a problem for parents, this is exactly what will help parents: once they set the age in parental controls, programs and websites will have to monitor access (following the law, not goodwill).

This way, access can be controlled at the first level, i.e., at the OS level. There is a law, and there will be others to help improve it. In the same way, you can avoid the use of identifiers and, in general, face verification and a bunch of nonsense.

Ultimately, the responsibility lies with parents who did not specify the user's age on the device. But there may be “products” that ignore information from the OS.

Current parental controls do not solve the problem well, because you have to pay for a bunch of questionable products, sacrificing privacy. And it still does not protect against outdated black/white lists. Therefore, the requirement at the OS level to have such control and place responsibility on “products” is an excellent solution in my opinion.

And quite an elegant one at that. Without involving any government identifiers or anything else.

Combined with the widespread implementation of TPM, this will become even more feasible.