Microsoft is set to become the world’s third-largest gaming company after announcing plans to purchase embattled video-game developer Activision Blizzard for around $70bn. The all-cash deal, still to be approved by US and European regulators, gives Microsoft ownership of popular game franchises Call of Duty, Diablo, and World of Warcraft, but also significant baggage in the shape of a problematic workplace culture at the gaming industry giant.