This claim still needs some development, but the OP of that thread would be able/allowed to open a type 1 flag against GP.
With sufficient support, it would give GP the "!!!" tag next to his trust score, and show a red notice (instead of neutral yellow) above his threads.
Yep, that's what I thought. If that claim is genuine, that OP has to be helped in this direction (flag).
GP is a trickster. But yeah, scams are not moderated.

I know; that's why we have to make sure we use the tools provided.