From the auction thread, it definitely seems like they've scammed a few people. But, i'm not sure they're anonymous. The company name they listed on their website is a German one. It appears to be a valid company, registered to (what appears) a residential address in Munich. In one of their posts they did say they have an "office" in Munich, so that part checks out.

However, before any cyber-warrior goes on a witch hunt -- be very careful as it's very possible or even likely they just hijacked someone else company name who has no affiliation with these actual scammers.