From Wookiecookie on the Reddit thread. For clarity, everything not in this box is a quote. I'm lazy and quoting my part is easier. To be clear. Everything in this box is Imperial Pandaa. Everything outside is Wookiecookie.
Gonna piggy back off this comment to address a few things!
Riot will not ban a player for off meta-play; full stop. If you're curious on our thoughts about off meta play you can hear it straight from Meddler here: https://www.youtube.com/watch?v=VMAAfm095tg
This player in particular popped up on our radar a few weeks ago and we decided to not take action at that time because playing Teemo in this method is not against our rules.
However, after reviewing the continued reports we were receiving (from multiple sources) a pattern was forming where this targeted off meta behavior was occurring most often in games when the player was with a high profile streamer. If you want to play off meta, we think that's great! If you want to play off meta only to spite other players and reap the negative reactions and attention from their viewers while they are streaming then we don’t consider that a good faith use of off meta play.
Reporting players for trolling is not something only streamers have the power to do. I always encourage people to report through the client (obviously). But if you encounter a player that you think is behaving in a way to get around our systems then anyone can send us a ticket directly and we will investigate that situation. We won't take action if we can't determine a pattern of trolling or if we believe the player is making a good faith effort with their off meta play. But if we do see someone is consistently using off meta play as an excuse to troll people then we will intervene when we can.