What does it take for you to claim a game as "dead"?
Maybe name some examples if you like.
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A game I'll use as an example is cod ghosts on the PC. 3 game modes are playable: team deathmatch, strikezone, and hardcore team death match. I'd consider that dead, as I've yet to see it reach 2000 players online, and it has no dev support as it is an older cod. I assume it's the same on console but I've not recently played it there so I can't speak for it.