Why is perma ban a thing

Why is a perma ban a thing. People spend tons of money and can just have all that taken away for being an asshole? Why not just perma mute it would serve the same purpose (excluding feeders). Its fine to temp mute someone but not perma mute makes a lot more sense. Not like 98% of all league games use low if any communication anyway and supposedly the smart pings can communicate anything you wanna communicate. Riot is not the brightest company tbh.
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