They're actors following a script, seems to be an increasingly common thing these days, The Division did the same thing. Companies seem to do it to try and suggest people roleplaying as the characters or something, whereas of course we gamers know that comms are usually more like
player 1 : **** my mouse is all over the place
player 2 : afk bio
player 1 : damnit, what an ******* , 1 player down already then
player 3 : IS MY MIC LOUD ENOUGH??
player 4 : Jesus !! turn it down
player 2 : bk , what we doin?
player 3 : Sorry
player 4 : **** come on guys, lets get going, I've only got half an hour
player 1 : wtf did you join for if you only have half hour??
player 3 : *plays some rock music down the mic at max volume*
player 4 : christ , turn that **** off !
player 3 : **** you
Player 3 has left the game
Player 1 has lost connection
player 4 : Well this was a waste of ******* time
Player 4 has left the game
player 2 : k guys, I'm ready to go......guys?