Reporting only works against toxic players and nothing else.
I do report people and write pretty long explanations and it does nothing I made a list last season since people Kept telling me the system works so every time someone 100% trolled I put that name on a list and checked up on them during while waiting for a game every now and then AND GUESS WHAT none of them actually got banned they are still playing.
The draven that got made like 8 mins in from the support that gave up and started taken my jungle and just feeding still playing and playing consistently and still does that great.
The bard that got his champion banned by the jungle so he decided he would just troll all game yep nothing happened.
The vayne who said she was done since she was playing horrible and started trolling even saying she was trolling yep still playing.
Do you need more? Since I have a lots of stories for just last season.
The system is horrible and anyone can see that especially in low elo where it feels like every game since nothing happens to them.