Australia

Giving them a simple yes/no to the question of if you are legal age based on a trusted third party

Who's that trusted third party? There's no third party that I trust with that information. I don't want to have to tell the government "I use aussie.zone, and this is my username". I don't want it even without the username part. And I'd trust the government a hell of a lot more with that than any private company.

The problem with your comment is that you're framing it as all about Meta. It's not. It could have been. Maybe even should have been. Have it apply only to specific platforms designated by the Minister. But the way the legislation was written, it applies to all social media. Including Lemmy instances. Including Mastodon. Including old-school forums. This is why all sensible people were opposed to the bill when it went through within a week late last year. Not because the underlying goal is bad, but because it had been rushed through without proper consideration, and it was missing obvious problems that arose from the way it was drafted. Problems which could have been addressed, if they had done a proper inquiry and responded to feedback from experts, knowledgeable amateurs, and the broader public.