PS4 players must turn off crossplay unless the want to play with friends on PC
Turning off crossplay makes a complete different experience. Fireteam can’t see and can’t shoot the predator easily and it feels the game as it should feel. Predator is more fearsome (and sometimes OP) and getting to the chopper seems like a difficult task.
Some people complain that fireteam is op others that predator is op and in the end it is clear that the experience depends from the systems that you play with or against.
PS4 players have very difficult time to see and shoot the Predator while PC players have better graphics smoother fps and mouse and keyboard. That results that a PS4 predator have very very little chance surviving a PC fireteam because they can see him easily and they can make him bleed easily and a PS4 fireteam have very little chance surviving a PC Predator
So I believe that crossplay should be off by default

