What I see is that payment was made upfront. I don't know if this is usual or what because I have never participated in review but I suppose that if the payment was made after submitting a satisfactory review instead of upfront, this wouldn't have happened. However, I understand that maybe the payment was made this way for simplicity and convenience.
....
The project had good intentions so that participants wouldn't complain about not having funds to pay for the review service. It's just so sad that someone out there decided to use that to their own advantage by scamming the $90.
Paying upfront a way to encourage the quality poster users to participate with a
risk since getting tagged and refunding the payment is mentioned on the rules if failed to review and/or if the review is not accepted by the manager. Reading such rules will filter already those who are capable of doing it, plus the experience if the manager to picked its participants. But unfortunately, things happens and was never come back online to explain his side if he really got problems irl including internet connections. But until then, these negative tags and flag will serve its purpose.