@mullvadnet hold up! Mullvad wasn't censored. that word has a particular, specific meaning, and unlike most private organisations that might deny someone a platform, Clearcast has a judicial review ruling saying that it's a private, non-governmental body:
https://en.wikipedia.org/wiki/Clearcast
had Mullvad's ad been banned by the ASA, that would have been censorship - and indeed, since the ASA also monitors billboard ads, that might still happen... but what happened here was that nobody who broadcast the ads would broadcast Mullvad's, which is probably not terribly surprising given that they're all owned by companies with a vested interest in not letting VPNs get a foothold.
moreover, it was just that ad that was rejected. not Mullvad as a whole.
https://mullvad.net/en/and-then/uk