I don't think you should be able to re-join a game you've left, or re-join a game you've already won.
I was playing against someone who played a +4 Wild Card and was able to simply /leave and /join the game to give me a fresh hand and reset my card count to 7.
Additionally, I was playing with a friend who won a game (which makes you auto-leave it), and was then able to re-join the game and win a SECOND time. I think if you win a game you shouldn't be able to re-join the same game.
I don't think you should be able to re-join a game you've left, or re-join a game you've already won.
I was playing against someone who played a +4 Wild Card and was able to simply /leave and /join the game to give me a fresh hand and reset my card count to 7.
Additionally, I was playing with a friend who won a game (which makes you auto-leave it), and was then able to re-join the game and win a SECOND time. I think if you win a game you shouldn't be able to re-join the same game.