Interestingly with all the cameras on devices and AI/ML to recognize age and gender from a face, if this law came around nowadays they'd probably mandate face scanning to determine that you're of age...
It's all about responsibility transfer, I think.
If you've ticked some box that you should not have, then it's YOU who is responsible for whatever bad may happen.
> When a UK IP address attempts to access a website with pornographic content, the person browsing the web will have to verify themselves. It's up to each individual porn website to implement the technology that allows people to prove they're old enough to view the material.[..]
> The first [option from Yoti] is using your face. There will be the option to use the camera on a phone, tablet or computer and Yoti's "age estimation technology" will determine whether the person is old enough to access the explicit material.