It means that most people try to work together to achieve high scores, since there is just one score for the entire board.
It's not "wrong" to play competitively.
However, think of it like going out to hit the ball on a tennis court with someone; no game -- just hitting it back and forth for fun. In this kind of setting it is impolite to smash a winner across the other guy's court. What you really want to do is make it fun for your opponent, and he makes it fun for you.
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