Suggestion: In-game team event tips e.g. a sign in the middle of the Radiation Rumble 4 way tunnel "If you stand here you will lock out spawns, dumbo" with an appropriate multi-cultural idiocy pictogram for non English speakers.
Of course this would in no way be trying to TELL folks HOW they should play the game, and assumes that players are infact turning up to a team event to tag spawns for loot + experience, not just spoil it for everyone else which is of course a totally valid playstyle in a no rules anarchist society ... & breathe.