I had an account permabanned, and I have to say, I have become less toxic.
It really is a good lesson learned. And I generally feel better when I just mute everyone in game and focus. Just the pressure of my teammates judging my mistakes can make me tilt.
I still lose a LOT of easy gold 4 games, but that's just because I'm bad
But my behaviour has improved, so riot knows their shit.
My account got perm'd 3-4 months ago I think.