"What, then, is ethics? Ethics is two things. First, ethics refers to well-founded standards of right and wrong that prescribe what humans ought to do, usually in terms of rights, obligations, benefits to society, fairness, or specific virtues." -- https://www.scu.edu/ethics/practicing/decision/whatisethics.... Kant 1st Imperative -- Violates -- If everyone used Adblock, many websites would shutdown. I.e. "Adblock is…
Kant 1. Imp: One could deny the disappearance or embrace it. One could see the new forces leading the web away from ads as something beneficial for society as a whole.
Utilitarianism: There are many not quantifyable variables in a possible calculation. Just add seeing ads as exceedingly costly and your utilitarian argument in favour of adblocking is secured. Same goes for rule utilitarianism. E.g. Just measure the overall good generated by websites not by quantity but by quality. Get advertising in your quality metrics as something that reduces quality.
Social Contract: Spin another social contract: Page owners freely upload their pages knowing that the web is pull and users will select the resources displayed. One could argue that forcing them to download ads might violate this social contract.
Virtue Ethics: Alter the individuals opinion on his adblocking behaviour for your model. One could argue that there might be shame for someone not to block ads. (Which is a plausible case for a whole variety of ads out in the web right now.)