All publishing companies want to make the most profit they can. That's pretty much the only thing that matters to them, and Activision isn't the first to work that way.
Bungie was hot and fired up after leaving Microsoft, feeling like Kings of the coat-tails of Halo. They were prideful, arrogant, and full of hubris. They went into Destiny for all the wrong reasons.
Even if Activision formulated the plan, designed the weapons, and distributed the ranks; Bungie is still the one who pulled the trigger to assassinate their once good reputation. They could have, AT ANY TIME, put down the gun and walked away.
They didn't...
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wake up