But how does it work in practice? Say someone put a new adult site online right now that’s some random .com - how quickly and by what mechanism is this block list updated? Seems like mainstream sites that are established and/or big enough to care about being taken down would be compliant and easy to block.

And this is just DNS I assumed unless also keep a record of which ip addresses they actually resolve to.

To be clear I’m interested from the technology perspective and not advocating our UK friends evade government pr0n censors as a form of political protest…