I'm fundamentally opposed to age verification because it usually leads to mandatory account creation no matter how privacy friendly the age verification process itself may be. It's already extremely annoying that, for example, on YouTube, you can no longer watch many videos without an account. Furthermore, the whole thing also reinforces monopolies. Once you've verified your age on one platform, the barrier to switch…
Agreed, just make age controls available to parents, optional, and keep the user age data on the local device. External hosts can verify against it in obvious ways. But isn't that what California's law said, that commenters on HN opposed so strongly?