There is always the option of running your own locally.

This is probably service you can host locally with the lowest maintenance and hardware requirements so it isn't even a hassle to do it yourself.

Mullvad talks a lot about decentralization, then hands its resolver users to one of the biggest resolvers going. Quad9 is a good operator, and they actually fought Sony in German court instead of quietly complying. They still got ordered to block. That's the problem. A blocking order only hurts as much as the resolver it lands on is used, so every operator that shuts down and sends its users to Quad9 makes the next order a better deal for whoever files it.