The intentional feeding detection system is complete garbage
Observe as an ex-pro, season 1 player feeds his ass off on stream. Of course he got banned 25 minutes after this video was posted (https://www.reddit.com/r/leagueoflegends/comments/4j8oq5/therainman_banned_25_minutes_after_the_reddit_post/), but here's the thing: why does a video of this guy feeding have to make it to the front page of reddit before he got banned? For those of you who don't know, Rain Man is the former top laner of TSM from back in season 1 and early season 2. He was known even back then for intentionally feeding, going afk, and other trolling activities on his STREAM. He didn't even need to hide his behaviour but it took him until season 6 to be permabanned, and there's plenty of evidence in the linked threads to show just how much he was trolling even in recent seasons.
I've reported countless players for intentionally feeding in my games, and have recieved maybe 2 notifications of such behavior being punished. Why is that? In my most recent game I had a Tryndamere doing his best Rain Man impression, built nothing but vamp scepters until he had enough gold to upgrade those, constantly went afk, and every time he actually was playing the game he was running straight into the enemy team. Why do I have no faith that I'll receive a notification of his ban? Because he probably wont get banned. He didn't curse, didn't make hate-remarks, in fact he hardly talked at all. But if you take one look at the match history, look at damage dealt, build order, and number of deaths it's incredibly obvious what's going on.
Let me remind you that Tyler1 did not get a real permaban until he became famous thanks to reddit threads. I'm 100% convinced that if he hadn't gotten famous he would never get ban-on-sight status, and I'll say the same for the recent banning of Rain Man.