HOW TO STOP SOMEONE FROM FEEDING
This might sound bad but i swear to you it works. Lets say your toplaner is currently 0-2. Like most people hes going to be crying for help from the team and when the team is unable to help him he will continue to 0-4, 0-5, etc. So lately i've found that the best way to keep someone at the 0-2 is to call them out on it. Immediately i call them an intentional feeder after the 2nd death i say it in all chat. And THIS WORKS they immediately either see what they are doing is wrong or just begin talking back and not just dying. It sounds like toxicity but it cures the INT.
Edit- Say what u will but if u havent tried it u havent seen the results.