Ah, but there's a problem, isn't there? To build a case against the johns, she'd have to admit she was running a prostitution service, which she denies. So, the solution is to give it to the press, where those people will be found guilty with no trial, no due process and no way to defend themselves, because no one will believe them. And from what I can tell, most Americans are voyeurs who can't wait to see who's on the list.
It's quite a spectacle.
I haven't seen anywhere where she has denied running an 'escort service', not [as you state] a 'prostitution' ring. One is quite legal, the other not so.
Only by inference do you equate the two.