Although it doesn't happen all that often, and I've only experienced it once, that one time was enough. I really think there should be a message when a game you are participating in is deleted or you are kicked by a GM. Although most GMs will not be so cruel, returning to find a game gone without any knowledge at all of why is damned frustrating. Perhaps when kicking someone, a prompt for a message to that user should appear. Perhaps there should also be a prompt for a message explaining why a game is deleted, which is sent to all members of that game. If the GM doesn't want to send their own message, there should at least be a default message sent to the user(s).