Actually I think this cheater may be doing us all a favor. Having a cheater as the #1 in the ladder should go a long way to help bring awareness to this problem and prompt some action against cheating.
If developers doesn't have knowledge nor resources to face the problem, even a #1 ladder cheater won't be decisive for a change...
I am ignorant on the subject, can you explain to me why you didn't see all this on voobly?
On Voobly there is/was way more moderation.