Make an AD play when you die to discourage feeding/griefing
I think this might be worth looking into, especially if league ever becomes a mobile game. The ad would get longer the more deaths you have. So if you died 5 minutes in, you'll get a 2-5 second ad. Went back to lane and died? 10 second ad. Instead of the laner flaming right after they die, enough time will have passed that they probably won't say anything at all, reducing toxicity.
This would also probably help riot with money.
I just came with this idea because I enjoy being rewarded playing my mobile games watching ads for bonus points/rewards.