Intentional AFK Troll

Just had a game where a person sat at base at the beginning of a ranked game and was taunting that he was purposely going to afk and not allow for a remake. Sat at base entire time and left game a few minutes in. I see from his history, that this is not the first time of doing this. Looks like his method of revenge against the game when he doesn't do well. Sadly and unsurprisingly, Riot's wonderful banning system apparently hasn't caught on yet...