What does it take for you to claim a game as "dead"?
Maybe name some examples if you like.
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When casual players begin to quit playing and the only players are dedicated, sweaty kids who have invested $100+ on micro transactions and stream it all the time.
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When the company stops regularly updating it. Some CoD games still have s good fan base, but are (in my eyes) dead, as nothing new is coming to them. Like movies from an actor, you can still watch them, but since they're dead, nothing new will come from them
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When the devs stop supporting, adding content to the game, and when the playerbase falls below a certain number of active players (let's say, 1000 players). For example, it is almost impossible to matchmake in battleborn right now due to the small number off players still active. The division feels a bit empty too nowadays.
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If a search for players takes longer than 5 minutes, then it's pretty dead to me.
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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.