I guess most peoples concern is that it means storage of their information somewhere in a database to allow the access. You may have got IDed buying physical porn back in the day, but the bloke in shop wasn't taking a scan of your ID and putting you on a list of people who'd brought some grot.

While the idea of protecting children is admirable, at what point does it become a state issue rather than a parental one. There's ways to control and limit what a connected device can view and those tools should be used before we go for the nuclear option. As a millenial with boomer parents, and the wild west nature of the internet in the 90s I can understand the situation meant my parents couldn't really be expected to understand it all. If you're a gen X/millenial with kids now, you should understand tech enough to sort this out yourself.