The system works
I just had a game in which my support accidentally took our Grave's red buff while leashing and one of the little krugs as well.(That was an accident too,how it happened was that my support apologized so Graves asked him to help him at the krugs and so my support killed one by accident).But due to that,the Graves was flaming Teemo(my support) for putting him behind the enemy jungler.
We were against a Heimerdinger adc so it was tough,and Heimerdinger had gotten 2 kills.At this point the graves walked up to the Heimerdinger when we were under tower and died in an instant.So he started flaming me for feeding and not helping in ganks.
When I told him that feeding isn't reportable and I won't get banned,he said that he is "An ambassador and have banned 50 people this year alone".I told him that he has lost his mind and that he is delusional if he thinks I will get banned.Well.we lost,and in the post game lobby he told me to search his name on the internet to see how many people he has banned.I did,and.....nothing related to him came up except for his op.gg.
And then I reported him.And when I left the lobby,I got the message of the Instant Feedback Report.
He sent me a friend request and I taunted him.And he was still insulting me.Then he blocked me.
I had to share this to tell people the system works.It made my day.