fun fact about matchmaking
Q: who will win more games - an honorable player who does his best to help his team win every game, or a troller who intentionally feeds in 1/3rd of his games but tries to win the rest?
A: in a matchmaking system everyone wins the same 50% rate. in this example the intentional feeder would still win the same amount as the other player. in fact it would barely effect his mmr to throw 1/3rd of them. it would just give him easier matchups for the others he is trying to win.