I was told the last site recieved what was, essentially, a 'cease and desist' type email. these had arrived before, and the site runners were getting sick of them. the site runners had considered revising the sites rules a few times, but honestly, none of us wanted to listen. (I certainly didn't). So, they just decided they were under no obligation to keep the site running, and closed it down. I was not able to verify any of this beyond the first source-point, but it seems like a logical sequence of events.