One of the posts on Page 2 of the link seems to say (my French isn't perfect but I think I got the gist right) that the poster has phoned his mother, ascertained that he's "up to his old tricks again" and sent him an email saying that he has the guy's full details...name, address, email, parents' names and phone numbers etc, and if he doesn't stop it, he'll make a formal complaint to the authorities citing the many other instances (including those on that site) he knows of as evidence of a scam.