Ragequitting isnt a problem. The punishment for doing so is looking like an absolute douchebag, so coming up with an official punishment is stupid.
Who likes ragequitters? No one. That should be enough I think.
That is probably one of the worst punishments ever in terms of effectiveness. The fact that a group of people think negatively of you over the internet isn't enough of an incentive to make anyone stop doing anything. That is precisely the reason why an official punishment is actually needed so that this problem doesn't get out of hand.