I know a little extra effort required by you. But it would be great if you randomly google search text from member stories. An online platform does after all depend on trusting one another, since no one actually knows the other. But trust can be misused and it would be better for all concerned if there is a 'background check' for the stories on offer.
Glad that you haven't decided to scrap the entire program because of one bad apple :)
I'd rather not have to put in extra work to check the people in the group. I'd rather take each person on their own merits and assume they're genuine.
I'd not do that, it's punishing everyone for the fault of one. Just turfing out the bad apple works fine :)