Over past 2 weeks of my ranked games, I have never received a notification that a players I reported were banned.
I only reported people who were literally about to lose the game. Those people who could specially run several times to the enemy tower in the first minute of the game. Those people who specifically went into the jungle, playing for support, when I ask them to stop going under the enemy tower. Those people entered the game only in order to troll, and not win.
Every day, 3-5 times I come across such players, and their number only increases with each season.
The riots no longer pay attention to this game, they have a bunch of new games coming out that they will bring them money. Sports discipline is no longer a league of legends.