Why hasn't Teemo been taken off Free Rotation pending Rework, Riot?
Yorick and Poppy have both been taken off of free rotation due to them having anti-fun kits, pending their reworks. These champions are seen as hard to play against, and hard to understand the counter play to for newer players.
Teemo is a champion that Riot designers at PAX South this year admitted had frustration as a unique outcome. If a champion designed to be frustrating to fight against isn't anti-fun i'm not sure what is. Teemo is known to be difficult to lane against, simply block off parts of the map to his enemy team, and to cause people who are walking around to suddenly lose half their health unless they relentlessly pink ward and sweeper in front of every step in Teemo's area.
Further still, Teemo isn't picked generally as a serious champion due to his lack of ability to teamfight, and is seen as a troll pick. A champion whose only purpose is to frustrate and is widely known as useless outside of lane seems a strong candidate for the Poppy/Yorick treatment. In a game about having fun, why is a character made to frustrate so ignored and left to be an irritation?