When we first launched our partnership with Activision in 2010, the gaming industry was in a pretty different place. As an independent studio setting out to build a brand new experience, we wanted a partner willing to take a big leap of faith with us. We had a vision for Destiny that we believed in, but to launch a game of that magnitude, we needed the support of an established publishing partner.
Source: N4G PC Bungie to Assume Full Publishing Rights for the Destiny Franchise