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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It’s a hard one to figure out, great that you punish the ones leaving but then if there kicked suspiciously they are punished for no reason. Also if no penalty if someone leaves, just get someone to leave and you don’t loose a round on your card.