I feel like there is no reason for giving a ban to  "AFK goers"  who played in the 5stack lobby. It's because we understand why our friend has gone AFK is it due to a power cut or any emergency situation which will be notified through phone call. In a 5 stack lobby, we hardly see one using a pistol at spawn and throwing a game or one who quits the game because of a toxic teammate or loss of the first 5 rounds and goes AFK. And they are the ones who need to get a ban. I hope this really comes to Riot's attention and at least they reduce the penalty.