I've read before that this can actually be harmful for the person whom you're trying to help. The article was in reference to a pirated android app. The author

I've read before that this can actually be harmful for the person whom you're trying to help. The article was in reference to a pirated android app. The author noticed some crazy amounts of ad traffic from one of his apps. Evidently, the pirates were using this as a method of compensating for stealing the app. As it turns out, since the conversion rate was so low (a lot of clicks and no purchases) his ad revenue became basically zero dollars. So, they stole the app and made the only other revenue stream worthless.