Adblock isn’t allowed or disallowed somewhere in the ten commandments or fabric of the universe or whatever. Personally, my outlook would dictate that it’s bad if it causes harm, so prove that harm is done to someone. Even then, if the harm is sufficiently small, I’m alright with doing it for my convenience, e.g. there’s some small risk I hit someone when I drive but I choose to drive even when sometimes I could walk.