What's the cut off then? If I get matched against golds and plats that really know how to take advantage of a lead (as a silver player, this happens at times) and camp the shit out of me and tower dive, 3v1, constantly roaming to my lane, while my team stays in their lanes, I'm gonna feed. It just happens sometimes.
Now if I gotta worry that at some point a system is automatically gonna ban me for feeding, I'm just gonna have to leave the game. That system doesn't make any sense. It will just mean once someone falls behind, they re gonna take the leaverbuster instead of getting their account banned completely. So comebacks will NEVER happen because people will just leave out of fear of being banned, even though they're doing the best they can. Sometimes the team has a responsibility to help you out when getting ganked repeatedly by more than just the jungler. But sometimes the team ignores that and chooses to farm and flame instead of doing something productive to help prevent the snowball that's forming in front of their eyes.
This isn't me making excuses, I am garbage at this game, I know that. I'm just thinking of scenarios that feeding happens and it's not intentionally, and it's almost unavoidable. You've never fed? Would you be fine if your account was banned a long time ago, and could be banned again if you feed again? What is the feed cut off? 8 deaths in 10 minutes? 7? 6? Why? Do you have statistics that give your numbers reason? Or is it an arbitrary number that you see fit? Did you just not think your idea through and you were just kinda throwing it out there for whatever reason?