Sounds like it would be better for you to try and connect with those women and help them get the courage to stand up and testify..Unless the girls are willing to testify, it will be hard for police to do anything. With underage stings, the police control it but this pimp hides in the shadows, out of the scope in which police can see so they will need to rely on the girls to testify. Which many are scared and for good reason.
More of that and there wouldn't be an issue with the text apps, and us good real men can stay private, which is the whole point of discretion.
To me that's a win win, you get women out of a bad situation, you get the dirt bags in jail, and with a enough of that happening it will prevent others from doing, and good men don't get screwed over.
I am sure there are some other good benefits, too.

