If it's the former (which is how I interpret it), then they should tell you what IP you've violated or who your accuser is. I understand they want to be vague to avoid giving information that may allow spammers to game the system, but I think they're going to be more persistent and sophisticated anyways. This leads to an ineffective deterrent technique and a poor experience for customers. You'd figure Google would have people smart enough to realize this.
"Upon further review, we've accepted your appeal and have reinstated your
So, I still don't know what the problem was.