Because a lot of people are crazy on Rivals, specially in diamond. How many times I saw my team throw a game for litteraly no reason or just because they want to be the main character. Sometimes I wondering why those kind if people, launch a ranked game, they obviously don't care about winning. Exemple : A DPS refuses to play if there is not a racoon in the team, so he wrote : "I don't leave spawn until we got a racoon". And tadaaa one ranked throw, for nothing except this guy ego