No penalty. That's not cool. Some people maybe NEED to quit. Penalties in video games is the absolute most stupid and ridiculous idea ever. Do NOT penalize someone for doing or not doing something in a video game. Just because someone upset you, doesn't give you the right the request they get banned.
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The ban should be 5-10 minutes to punish people who quit for no reason yet allow the person to do what they need to do and not come back to a 30 minute wait