The only time I've deadbeated (and I kinda felt bad about it, but not really) I had played my first turn in a team game, and then PMed my partner about strategy. He never responded, didn't play, had never played a game before, and I had fortified most of my pieces over to him already. So I didn't play again and even though I PMed him another time or two I never heard out of him and he didn't show up on CC again. Is that ethical?
I feel mildly bad, but I would have been playing me vs. 2 other teams of 2 and had already given up many of my armies. I felt bad for the others stuck in the game, but hey, I'm a big fan of adding the forfeit button and were it there I would have hit it, even if I would have lost the points. As it was, I forced the rest of the team to wait on me and my no-show partner for 144 hours and walked away unpunished in score. So if you want to berate me verbally I think that would be fair.
“I am not only a pacifist but a militant pacifist. I am willing to fight for peace. Nothing will end war unless the people themselves refuse to go to war.” -Albert Einstein