Some of the mobile games definitely use questionable ways to present the ads. If anyone has ever played Subway Surfer (on Android), they can probably remember the countless amount of times one may accidentally click on the ads. On top of that, the ads load in such funny ways at times that it is hard to avoid clicking the ad.

As an advertiser and publisher myself, I feel bad for the people spending money on advertising in that game, because the 99% of the time that I have clicked on an ad in that game is because it was a mistake.