Activision does not merely publish, does no one remember the Infinity Ward controversy. They tend to do a lot of micromanagement of there games. They stole Modern Warfare and Infinity Ward from the guys who founded it. It is not above them to impose there vision of a game on there developers. With that said, you will understand why Treyarch and Sledgehammer will use Destiny elements in there games. Activision "encourages" it