It’s a market for lemons [1]. You, the player, have no information about the teammates and opponents you’ll be matched up with. Therefore, over time, high quali

It’s a market for lemons [1]. You, the player, have no information about the teammates and opponents you’ll be matched up with. Therefore, over time, high quality and well-behaved players tend to exit the market, leaving only the cheaters and tantrum-throwers. [1] https://en.wikipedia.org/wiki/The_Market_for_Lemons https://en.wikipedia.org/wiki/The_Market_for_Lemons