

Doesn’t seem to be a DNS block. I just set Mullvad to the UK and visited one of the pages. Mullvad does run their own dns. Still got cloudflare 451.
The error message reads like the website is using Cloudflare CDN, so Cloudflare’d be able to block any requests originating from the UK.
Cloudflare’s CDN is definitely used by a lot of torrent/piracy sites (e.g. 1337x, thepiratebay, Anna’s archive), so we’ll see what’ll come off this.
It’s not just convenience - depending on how you use it, Cloudflare is also pretty good at giving an additional layer of anonymity. They assign any user of your site to the closest CDN Server geographically, so it’s is pretty hard to determine how and where your site is actually hosted. They also used to be pretty good about resisting takedown requests.
Oh well. I’d say time for a federated CDN, but the legal costs would probably be rather annoying for most volunteers.