Experience has taught me they have no such qualms when keeping advertiser money whether or not they revoke publisher earnings. As a teen (back in '09), I ran a

Experience has taught me they have no such qualms when keeping advertiser money whether or not they revoke publisher earnings. As a teen (back in '09), I ran a domain parking network that was used by a modest number of users (about 50 users with ~300 domains total). At the time the Google AdSense TOS allowed any site that had "content" (there was no stipulation about it being original), so my network worked by displaying random wikipedia articles that are relevant (using a very simple algorithm) to the domain in question, along with several adsense blocks and a few other features. Each domain was also a fully functional wikipedia mirror, and content was properly attributed etc.. Anyway, most months I would get a payout of around $800 that I would then distribute to my users (I took a 20% cut). At 11:30 PM the night of payouts one month, they decided to change the TOS, revoke all of my earnings, and suspend my AdSense account. I sent an email to my users explaining the situation and I actually paid them all out-of-pocket for the missed earnings because I had the money to do so from doing random web design for local businesses and I felt quite bad -- some of my users were in dire rent situations, etc., and I was in regular contact with them so I wanted to make them whole even if it meant I would lose a good bit of money since I was a teenager without these sorts of problems. Anyway, one of my friends ran his own online service (a network of web proxies) and he actually specifically advertised on my network because for some reason the traffic converted well for his particular service. I had him check his AdWords spend several weeks later and we discovered that he was never refunded for the ads that ran on my network, even though those earnings were taken away from me. In other words, at least back then Google probably didn't refund advertisers in cases of clickfraud, etc., unless the advertister specifically knew they were being defrauded. At least that's what appeared to happen based on the info I had access to haha. They are super shady.