The big question is; Why would you need an auto-blocker for cRPG anyways?
Enough people suck at blocking that I think we can safely say "blocking is hard", and that's why some are tempted to use it.
The REAL question is; Why would you want to risk getting your account banned forever over something that doesn't protect you from arrows, bolts, throwing weapons, horse knockdowns, getting surprised or just plain old being ganged up on?
I could at least understand people cheating like that if this was a 100% melee game but it's too much risk for too little benefit when there are so many things it can't help you with.