Most of the age verification laws are written fairly openly, probably so the verification companies can come up with all sorts of crazy anti-privacy shit.

However that also means some companies have done the opposite. They can use other methods of verifying age, like common sense. Your 10 year old account alone is enough to reasonably expect you to be over 18 for instance, you probably weren’t under 8 when you made that account.

Most aren’t going to bother with that though, it’s simpler and easier for them to have a third party violate your privacy.