After fifteen minutes of game play if a player sits in or near their well or hasn't killed an enemy creep or attacked a hero in a one minute duration and there is still at least one main base tower standing, the vote kick option is enabled. To pass the vote you need two acknolwedge votes. The guilty player is given a loss(which goes toward their leaver percentage) and can't re-enter the matchmaking queue until the current game is completed or fifteen minutes have past which ever comes first. This would greatly reduce the amount of afking seen in the game.