The game crashing or error coding is one thing. Granted, I don't think they can do much about it crashing, but they could probably figure something out for the error coding part. However, straight up leaving a match just cause your losing isn't an argument. That is the exact reason why the ban is even a thing. If you think it's toxic to stay in a match just because you start to lose or are down a few points or rounds, then you are the toxic one. It ruins other players' matches when 1 person leaves after a slight disadvantage of any kind. If your rage quitting matches and getting banned, then those people deserve it. Don't ruin others' matches and time just because a match isn't going how you wanted. If you have such an issue with getting banned for leaving on purpose, then don't play the mode or don't complain if you get banned. And as you stated, at the end, it is just a game, so if you aren't enjoying it or certain aspects of the game, then either don't play those parts or don't play it at all.
I disagree with that about leaving is being toxic. Nobody is going to enjoy losing badly, getting pub stomped by the other team. If your team is 0-3 or 0-4 then leaving isn't going to ruin the match for anyone. One your team is going to lose regardless if you stay or not. Two the only people having fun is the team destroying your team, they will be the only ones truly impacted due to one less player to kill on the other team.
Like I said nobody enjoys being pub stomped, so those players should be allowed to leave without being punished by a ban, just giving the lose on the card or point deduction in comp is enough since that was going to happen regardless if you left or not. But a ban is to much. Especially if the game crashes and its out of your control.
Ok, but leaving is in your control, and so is just not playing if you can't handle losing a match. I've had too many matches where someone like you leaves in the first 2 rounds, then me and the other person start to bring it back, but we are at a constant disadvantage due to people like you leaving all the time. If you can't handle the modes in a game, then don't play or at least don't come to a forum and admit to being a rage quitter. Also, to claim a ban is too much for constantly leaving matches on purpose, which is the exact reason why people like you who think it's fine deserve the ban