That's not the way it is being used elsewhere in this thread. They're calling what Ad Nauseam does "ad fraud" and are saying how easy it is to spot and fight against.
Probably because the posters are working in an industry where click fraud is a serious business concern.
Can you point to an example of such a comment? I don't see anyone saying that what AdNauseum does is ad fraud, just that it's detectable via the same mechanisms that detect ad fraud.