If we're going to do this at all, it should be on the device, not the website/app. Parents flag their child's device or browser as under 18, and websites/apps follow suit. Parents get the control they're looking for, while service providers don't have to verify or store IDs. I guess it's just more difficult to pressure big dogs like google/apple/mozilla for this than pornhub and discord.

This sounds pretty reasonable to me. What am I missing?