They're relying on me doing work to run a browser that renders their ads, rather than providing a binary. They're not sending me a page of ads, they're sending me a couple files that I can choose how to show and what to put through a JavaScript interpreter

I have revanced which edits their binary to remove ads. I don't see what your point has to do with mine though. My point is this: adblock users are grazing from youtube's field. We are eating the grass that youtube has planted and watered. To expect that such a field exists and then to expect that it can be eaten from at will is entitlement. To say "but they put up no fence" (or, more accurately, a weak fence) is not a refutation of this point. In fact it is exactlty what defines it as being a tragedy of the commons.

As GP said, maybe this is not your position, but it's a common enough one that their comment is not out of line (given that you are the one who replied to them).