I don't see what they can do. I'm not privy to the inner workings of the system, but from what I've heard the radar only reads data from the game client. If it were accessing the server then SE would be able to detect it, but as is they can't tell who's doing it.

Of course, ignoring chatlogs of people bragging about using it isn't making us very confident that they're even trying. Nor is deleting every thread that mentions them. It's like they're going out of their way to ignore the issue.