What do you think is happening behind the scenes?

You realize this is the case for EVERY MMO, right?

Runescape has no hacks or dupes.

There was a massive bot problem, one that Maple could only dream of having, and may have even exceeded WoW's botting porblems. Then Jagex was like "hey guys we finally got a fix for this," and launched a bot nuke that trampled all the bots right then and there.

Of course, a second bot nuke was planned shortly thereafter. With good reason, because many bots are reappearing as more and more of them find ways around the first bot nuke.