Why am I not banned?

I am playing since the mid of season 4 and I usually use the chat in my games, so why am I not banned yet? I have learned on the boards that using the chat gets you banned no matter what! I even wrote stuff like "You kinda lost us the lane, there" and "It's not the junglers fault if you screw up the toplane duel" and even "You played that really bad" Does my account have some kind of immunity? Because I have read that these kinda things get you banned very easily.
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