Rage quitters ruin games.

So i have been in a lot of games recently where i have a bottom laner who has died twice, than he/she would just quit after death 2. I find this lame and not fun at all. And i think that Riot should serve a more hard punishment for people who quit mid game. I have reported lots of people on my team and on the other team who have left the game. Back when i used to play, if i was to report someone and Riot gave them a punishment Riot would send me an in-game message saying, "Thank you for reporting the player, we have given them a punishment." But now Riot never sends me those anymore. And i am upset because i'm wondering if Riot actually did anything to stop them. So i'm wondering if Riot is actually punishing these kinds of players.