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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The amount of people that would leave solely to deny the other team a win, especially in blowout wins would be huge. I can respect the idea, and it’s for sure frustrating, but punishing the enemy team for winning is a good way to breed toxicity, and punish players who did nothing wrong. Imagine you’re on your final game, and are up 4-1. Then an enemy decides they don’t want you to win, and leaves. Not only is you’re victory taken away from you for no reason, but now there’s a chance you’re denied flawless even though you earned it already. Seems like a deeply flawed solution IMO.