I'm having trouble finding information about what laws cover "click fraud" or "ad fraud". The article mentioned that this was illegal behavior, but never provided any more detail. The closest I've gotten is US Title 18 - 1030, though I'm not sure if the article is even talking about US law. I did stumble across an article from 2014 arguing in favor of making click fraud a federal crime, which cited this advertisement:
http://www.legalmatch.com/law-library/article/click-fraud.ht...