I'm guessing they aren't looking at just how much zullie is in the world, but I bet you anything they can see a log of each action in the game, so for example if someone is cheating by bugging a quest over and over that gives them zullie over and over, then if admins look in that log I'd be almost sure that they can see a looooong repetive list of the same action over and over and over, then they can sort of get a hint of what's going. So in other words, if the developers made a quest that allows you to get zulie and do it only once, and the admins check the logs and see that the quest is done 100 times in a row by the same account, then booya! there's cold hard proof right there that the zulie was earned in a bad way. Just an idea, but a good one I thought.
but the ones that have no idea wat zulie exploiting or uw exploiting is... they are innocent and will most likely be unbanned?