If "Vote to Kick" system would be implemented, what would be the downsides of it?

After I had an intentional feeder, it got me thinking, if it does not exist, there there's probably reasons for it. Probably it could be abused, but I can't think of a real situation where it would be, 'cause the only thing worse than having an afk is having a person who literally runs into the enemy, gets hit once, and runs to the tower to give kills. All I could think of is a 4 man deranking premade kicking the one person and then losing the game, but having 4 man premades is a different problem to begin with. Any more downsides to it?
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