Comment below rating threshold, click here to show it.
I don't see why that's bannable. You're allowed to play your champion however you want, even if it is against the meta. However, if you're trolling your teammates while doing so, it is against the code.
In this case, I don't see Ashe as doing anything wrong other than learning to play a champion wrong.
You're not allowed to be banned for being bad at the game. That's just wrong. Not everyone can play at pro level or your level, and everyone makes mistakes, especially at low levels.