GameSpy Technologies has also responded to the issue on its Facebook page, and says that the server shutdowns are a result of the game developers choosing not to pay their service fees, and that "in some cases this lapsing ranges back as much as four years." GameSpy Technologies tells players that it "cannot be expected to provide a service free of charge," and that's why these servers went down. The company also says it was the developers' responsibility to inform players of the impending shutdowns, and "it is regrettable that these publishers chose not to inform their users of the impending discontinuation of support."
Now, developer Rebellion said that GameSpy had changed its rates to be "far in excess of how much we were paying previously," but GameSpy Technologies reportedly told GameSpy (the editorial outlet) that server fees haven't changed in eight years and there were no increases made or even plans to do so. Someone, in other words, is mistaken. Joystiq has followed up with both parties, and we'll update this post if we hear more.