Illfonic’s limited support.
It is so strange. They were allowed to make this awesome game with innovative gameplay and great atmosphere true to the first movie. And the playerbase is still quite large. Many other multiplayer games are long dead after two and a half years with servers shut down.
Maybe, it is just Sony that keeps this game alive.
Also got the impression somehow that Illfonic tries very hard to get rid of Predator: Hunting Grounds but YOU don’t fullfil their wish and let it die but keep playing. You even buy Illfonic’s low effort DLC so Sony can consider DLC sales as sufficient to keep the game alive and ask Illfonic to keep going.