It actually makes sense, although perhaps the messaging is poor. Regardless of the reasons for you're being disconnected, there is a negative impact to your opponents, and as a result to the overall site experience for others with more stable connections.
Dear Sirs,
I just received a warning re fair policy. I have never intentionally interrupted a game or aborted a game-
However, I have problems with my pc and new games are often aborted by the server. I dont accept being called unfair.
With kind regards
Marianne-Andreas