what happens to players who are punished for intentionally feeding?

I know the tier system for toxicity, 5? chat restrictions, 10? then 2 week ban then permaban, etc.

But what happens to people who are found guilty of intentionally feeding? a couple days ago I had a riven in game with me who never talked to us, worked with us, or did anything and they ended the game 2/20/4, so naturally i reported them for intentionally feeding and i got one of those feedback reports that let me know my report did something, etcetera.

but whats the tier system in that? do they get chat restrictions or go straight to being banned? or is it totally vague? never thought about it before because frankly, ever since the automated system came out ive only ever gotten two feedback reports in all this time. The riven included. Just curious!