Cynthia Littleton Business EditorOne question follows HBO and HBO Max content chief Casey Bloys gets everywhere he goes: What’s up with all those “Game of Thrones” spinoffs?Bloys told Variety that he has been surprised by the number of people who believe that there are multiple “GOT”-related series in active production. For the record, “House of the Dragon,” a prequel that takes place 300 years before the events depicted in “GOT,” is the only spinoff that is real so far.