Whether they heard about the free tuition before they enrolled to college or after, all of the HOTs would have paid for at least one semester. None of them (not even fucking Maya)
needs this tuition so bad they have to prostitute themselves out against their will.
Cammy has her limits, she sticks to the glory holes. She questioned Mona's decision to go full on face-to-face sex, and she was right, Mona realized she made a mistake.
Remember, Mona wasn't actively looking for a freebie, but when Quinn mentioned it she probably though, "sure, I like sex this will be easy". But obviously not with sleazy older guys (sorry girls, these are the typical clientele...), so she bailed.
No one said Mona had to leave college or even the HOTs, but sure, Quinn put a little pressure on her since she was covering her own ass.
No coercion, no blackmail. Quinn was just recruiting girls she thought could hack it: Mel, Sarah, Riona - these were fine. Camila was a good addition too, Mona probably could have handled glory holes like Cammy if she was smart, but she overstepped her own comfort zone.
And all that talk between Riona and Quinn about Maya in the restaurant... yeah right...
There's only one dick (DIK) for her.