One of the issues here is that there is likely considerable overlap between people who are competent enough to circumvent the block with a VPN or the like, and people who’d be seeking out AI deepfake porn, just because the latter likely appeals to socially outcast (and unfortunately therefore often more tech savvy) people.
I’m in the UK and glad this has been blocked but I also absolutely don’t trust the weird internet puritanism of the UK government, for at least the time I’ve been following politics as a you g teenager, there have been many attempts to block various aspects of porn on the internet, normally from a point of protecting children but the whole thing has always reeked of the government testing public outcry on blocking parts of the internet to later re-attempt to censor on their interests.