I have heard some good suggestions a long time ago I think should be considered. If someone has been quitbanned they should have the option of returning to the same game they quit out of, completing the match would end the quit ban early. While quitbanned you should be able to join one Playlist that is specific only to people also quitbanned. This might cut down on some of the grieving. Yesterday I had someone on my time just continuously running out and dying. I typed in the chat asking if they were knew and needed help with controls and they said they were actually just feeding kills to the enemy. I was confused and asked why they wanted to lose and they told me they were just trying to end the game faster because they were trying to complete an objective challenge. 
Also, is there no AFK ban? I have had people on my team AFK most of the game without getting kicked and they didn’t even do the rubber band on the controller trick.