"I have always had a banner since they were implemented."
not trying to be rude, but seeing your recent matches i see why you still have yours. Vs AI i would say all the people playing that always honor after every game, and if its one of the game modes you play majority of the time that is the reason why you still have a Ribbon!
As for the topic at hand as someone like you who has never gotten a restriction of any sort, not banned, or faced Tribunal (when it was up) I have to say this game has been a lot less positive than its been since i have been playing this game. The amount of toxic i have seen towards people is just atrocious, and for the most littlest things, like missing CS, fighting in a 1v5, picking a certain champion, the list just goes on and on!
I would say i have been positive and try to help others the best i can, but some people just cannot be helped and i dont think anyone here can try and change people for the better, but i feel like Riot has been doing their best to try and keep toxicity out of the game! it will always be here, but i rather have rules and regulations on the problem than just having people act like this in all my game and having it be ok!