It's an exclusivity thing with activision which represents age content in my opinion. Wii u everyone which Skylanders have better sales on, Playystation teen which Destiny is made to appeal better and Xbox a more Mature aspect in which Call of Duty is better to play on. Now if your looking at it from Bungie and Microsofts aspect then Microsoft probably doesn't really care and is happy for bungie and reason for Bungie going for Sony is because Halo the entire series is on Xbox and not Playstation besides the exclusive strikes kinda suck anyway.