Re: First questions first
Just remember that the German courts have repeatedly concluded, on no less than five consecutive occasions, that adblocking IS legal, in part on the basis that we - the internet users - have absolutely no contractual obligation to watch or consume adverts. Full stop.
Quote from El Reg - http://www.theregister.co.uk/2016/03/30/adblock_wins_another_court_battle. "Adblock Plus's operations and communications manager, Ben Williams, said the court found there is no contract between publishers under which users have somehow “agreed” to view all the ads a publisher serves, commenting: "To the contrary, said the court, users have the right to block those or any ads, because no such contract exists."
I might in addition argue that the adslingers are stealing my bandwidth, or my electricity, or interfering with my PC, all without my consent, or that they are putting my security at risk with malware, but "no contractual obligation" is ethical enough for me.
Don't let the b******s off the hook!