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.