In my studio it was forbidden to have contact with customers even after our contract was over and the penalty was very, very, very high if it got out that we have contact. So it's still a great risk for the girl. And yeah, there were cases where it got out (user spoke to another girl from same studio, maybe even with no ill intentions, conversation was seen by the studio). I get the appeal of a "clueless" studio girl, highly attractive for white knights and other "caretakers", it's the way the system works.