From what I know, when they are caught they are reprimanded. The problem is that someone has to report them, and most people don't reveal they are using them unless to people who wouldn't report them. You'd just get kicked if you weren't up to par.

That being said, there's a much bigger problem with RMT bots than harassment from parsers imo. I actually haven't encountered anyone using them myself, but I have seen a crapton of bots running through dungeons and making a mess of things.