Make feeding in the 1st 10 minutes reportable and draft-bannable
I've lost count the number of times I've lost games because over-ambitious teammates go for kills and end up feeding an enemy so much that the enemy proceeds to wipe us all out. This seems to happen quite in bot lane mostly because so much is at stake and ADCs literally need only 300 gold to go from stable'ish damage to unholy amounts of burst. For me the 1st 10 minutes is for teammates to get gold and xp and, "traction" in the game so they have 1 item to go places with. When you feed in 1st 10 minutes, it is selfish because you may have just robbed your teammates any hope of getting traction, and a core item. They now have to compensate for your major malfunction and the game is over long before surrender becomes available. Your teammates have to play with your screw up for 10 minutes, waiting to lose.
Cursing at your team, or being a self-centered brat is one thing, but actively screwing over your whole team, by feeding in the 1st 10 minutes, is borderline greifing. This should be reportable, and hopefully bannable to teach people to play better. In terms of the ban element, ban them for draft-based gamemodes so they stop wasting people's time with their shenanigans. I think normal-draft should be included because people go through all the trouble, and time to build a team; making it part of the "draft ban" will respect the effort and time players put into the game. Also, their are folks like me that don't play ranked (I have had too much frustration with toxic players and bad teammates to enjoy ranked) and forgetting about us is not wise because I know number of like minded people who buy a lot of skins.