The Human Cost of Call of Duty: Black Ops 4

When reached by Kotaku, Activision would not make Treyarch’s management available for interviews or comment on the specifics of this story, but did offer a broad written statement, attributed to the studio:
Black Ops 4 represents three years of hard work, creativity, and passion from hundreds of talented individuals across Treyarch, Activision studios and publishing teams, as well as agency partners around the world. At the beginning of 2018, about two years into development on Call of Duty: Black Ops 4, Treyarch employees were called into a conference room for some bad news: The game’s campaign mode, which was to be centered on an ambitious two-versus-two multiplayer mechanic, was canceled. Treyarch’s last game, Black Ops 3, was planned to feature an open world until the team rebooted midway through production, scrapping the open-ended map in favor of a traditional linear campaign.

Source: kotaku.com