Except that wouldn't make a difference as far as the children data protection bit is concerned. It goes WAY beyond porn and governs the handling of any data that can be tied back to a child, including IP address, online aliases, and email addresses.

And it's not even just about selling it, but processing it and storing it at all. There's technical necessity exemptions, like routers aren't subject due to handling the IP address for routing, but stuff like logging the submitting IP address with an image to be able to handle abusive submitters would count. While it is a legitimate use, part of the UK law is requiring consent for doing anything with the data of someone under 13, and the current legal situation is "well, most sites probably break the law but you can trust us that we won't go after you if you give it your best shot".

I'm surprised more sites aren't pulling out of the UK with a law that seems designed for selective enforcement to get rid of sites the government deems "bad" while letting the ones it deems "good" or "harmless" serve as examples that they are trying to be reasonable with the law that basically makes websites illegal because 12 year olds can use browsers and might go there without parental consent.

Also handing the ones that do check age even more information, but it's OK because once you become an adult to do whatever with that information.