The fact that these bills target the internet and not the hardware is the problem, honestly. You can't region lock the internet. It's global, distributed and anonymous by design. You end up in a great firewall of China situation trying to control this end of the matter. It is the road to tyranny.
But you can region lock hardware because you need to be physically near your phone to use it. And given almost all (~85%) people already have contracts for their data and biometrics for their phones, there's already an identity system available.
We could break the network effect for children by drastically limiting access. Let me tell you, when almost no kids were online, it wasn't cool to be online. I was there, I was terminally online, and you will need no persuading to accept that I was not cool. 😂ðŸ˜
Anyway, this is just to say when the UK government comes with these bills, this is how you can tell what their objectives actually are: what area they target. I think it's important to protect children from social media, just like I think it's important to protect children from driving cars. I also think this is actually possible in most cases, if we actually try to find a practicable solution.