This is something that honeslty shouldn't need to be discussed. Today I was at my 7th game on a flawless card, and one of my teammates straight up left the match 2 rounds in, leaving the other 2 of us to loose against a full 3-player team and our flawless cards.
(Freelance for reference)
Therefore, when someone leaves a flawless game intentionally, it shouldn't count against, this way no one looses a flawless due to a teammate leaving. Those who leave intentionally should get slapped with a long ban that extends each match they leave before completion.
Could this exact thing be abused? Maybe. But it being a freelance only thing could help lower abuses as you cannot see the cards of teamates, and helps you not have your runs ruined by someone who quit in a 1-2 match for no reason.
Edit: Updated
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i saw a top player say maybe we should take away flawless. that way you are not penalized for a loss whether someone leaves or not. i know this goes against trials the way it is now they could just require you to win 15 games or 20 but they don't have to be consecutive. what would this do? it would increase the number of people that would be playing trials. we have done this flawless for trials for a long time maybe think about changing it up. it would cut down on cheating and dramatically increase the player base. it's not fair if someone leaves the team and you get a loss. there is nothing wrong with changing the way game modes work if benefits everyone. some will not like this post but it would solve a lot of problems and make trials a better game mode.