Tantrum..if you have time..How does the system deal with...

Tantrum had a game with a twitch that never went to lane, had less than 10 CS and never would fight for objectives. The twitch does get a lot of kills and tends to win games when you look him up on op.gg, but wow frustrating and trollish. How is this handled? Im on the fence honestly. I didn't provide link or name because I believe against rules. Thanks in advance
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