I'm Steven Black and they cite my repo as their source for adult content domains.
Mullvad VPN seems unclear on the concept, at least in regard to my resource.
Using my porn hosts variant directly, they are presently pulling-in 188,735 domains, of which only 43,108 are porn domains. The other domains are adware, malware, etc.
I also notice the mullvad/dns-adblock repository been in existence since June 7 2022, the date of its first commit. So this is a very new thing.
Why did you include adware and malware domains in a list named to suggest it only contains pornography domains then? Seems like a fair mistake on Mullvad's part.
Here is the readme: https://github.com/StevenBlack/hosts
If that could be more clear, please tell me how?