I think OF has also become a one-click outlet for nontraditional sex workers, e.g., those who wouldn't otherwise have done this type of stuff. From what I've read OF has even more "amateurs" than platforms like MyFreeCams.
Part of the reason they've gotten so much heat is because of cases of underage girls selling photos on that site for some time before they're caught. I don't know if they've found a solution to that problem or just come to some agreement with their payment processors