You joke, but as I understand it, all internet in the UK has Government mandated 'adult content' filtering by default and you have to go through a process to prove you're over 18 to have it removed...
So they are much more than halfway there already...
It's worse than that sadly, there is no way to have it globally removed. You either have to use a VPN or age check with every website that requires it (or at least whichever service they partner with, I've not even looked).
“ In July 2013, Internet Service Providers (ISPs) agreed to voluntarily offer “default-on” adult content internet filters on all new and existing home network customers” [1]
OK, so the entire industry does opt everyone in to content filtering by default, just every single provider, without exception, does it “voluntarily”.
So they are much more than halfway there already...