On the contrary, Koellerer with his idiotic behaviour pretty much attracted negative attention to tennis. He was the black sheep.
Actually they wanted to get him off tour years ago, but didn't have anything on him to do it. Yes, I'm very aware of his antics but he is small fish when it comes to fixing.
If the ATP were serious then they'd have helped get rid of Forstman one of the IMG top brass for betting when he shouldn't be doing that. This is the classic make it look like they're doing something.