"I can see that happening to sites that cant show their adds on your screen."
Back in the olden days when I was still using Windows, TuCows did exactly that. You could browse the software libraries for ever, but any attempt to download a file was met with a re-direct through the ad-server. IIRC, the only "ad-blocker" back then was a custom hosts file routing the ad-servers to localhost and blocking the TuCows ad-server meant no downloads. I stopped using TuCows, Blocking the ads was my response to the increase in ads per page and "in your face" GIF anim ads. (was flash a thing for ads back then? I forget, it's so long ago now). They "won" the advert arms race but it was a Pyrrhic victory since they lost me anyway.