Weird how the readme talks about hash collisions, but not in the way I would expect. Two blocked domains with the same hash isn't a problem, they both need to be blocked.

Where hash collisions matter is false positives, e.g. if hash(google.com) = hash(adserver.com). There does appear to be a web dashboard and /unblock api so should be straightforward to resolve.

Yeah, I think they have it backwards. As you say, regardless of how many entries you have locally, the collision risk comes from false positive hash matches not from worrying if the positive hashes collide.