Did Riot stop banning ppl?

I am not even talking about banning for flame, imo riot is dealing poorly with it, but i can just mute flamer and play on. I am talking about situation when two players wanted Neeko and when one of them didnt get it, he started trolling. Its not new meta(smite hecarim on mid), he threatened us that he will troll and was talking about that in the game. I think he typed enough things that even AI could ban him fairly, yet he wasnt banned (i didnt recive information after i reported him).Can someone from Riaot answear why is that? And players, do u have same problems?
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