Wait hold on, I can get banned for this?

So I just logged in and had a message pop up, the leaver buster thing asking me to agree to never leave a game again? First game I've left and I said to the team that I couldn't continue playing on 5 FPS and 300 ping, but I can get banned if I "need" to leave a game in the future rofl? Oh ye, it was a bloody normal game too.
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