No, why should you be banned? You are not sure to win against a lower rated player, but you will win more than you lose, like you are not sure to lose against a higher rated player, but you will lose more than you win. That is the whole point with the rating system.
Can someone report me if I am playing against lower elo players in open challenge?
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I used to play against players that on the same level as mine. Yesterday I saw this open challenge and play it. Sometimes I play with higher and lower elo players. Can I be banned because of this?