As this is a rather one-sided story, I'm inclined to disagree based on my experience with them.
Me and a buddy of mine are really big CAH fans, and we had been playing on a set of cards that he printed and cut at that point. We had also been meaning to start a project together, so to test the waters, we started working on a digital version of CAH that would be open sourced and could be freely enjoyed by everyone.
I made the wise decision to reach out and get their blessing before we really began working on it, and one of the founders replied in short order, essentially telling us that we couldn't go ahead with our project because they wanted to control what was released. It's been a while since the correspondence happened, so please excuse my memory, but it was something to that effect.
However, they were very courteous and concise the entire time, and were not even close to being rude. So I find your account a bit hard to believe.