You got a perfect point here, but trust me, this will never happen! These "quiz polluters" are long-time users who knew the maker when he was every day on that site, and some even know him from Facebook! If he blocked them from doing their quiz spam, he would expel them for good at the same time. Though it would be good for us :=D, he would not risk that, since these "quiz spammers" are the last group of old-time users that haven't abandoned the site for all times.