Blocking ads is a moral good, actually. Advertisements are psychic pollution and being forced to watch them is like being forced to drink contaminated water. If you have an effective filtration method, or a source of clean water, it is morally positive to use it and to teach others how to use it as well. In the same way, it's a moral positive to filter out advertising and use sources that aren't tainted by ads in the first place, and to teach others how to do the same.
@stellarskylark I set up a Pi-Hole yesterday and in the time it's been running it has blocked a full 25% of all the DNS requests. This is to block ads, tracking etc...