Considering it directly violates their ToS, and Nexon NA can't really do anything anyway that would violate that ToS like condoning third party programs, they wouldn't be able to. Unless Korean Nexon decided to. But considering that they're cracking down on hacking more it's highly unlikely.
As if I would personally roll on one? Probably not, just because at worst I use them for a bit of easy AP farming and not for anything else really. Though I did make a new account that I'm gonna do nothing but use hacks on for the hell of it.