Well the answer to that is on the page. Apparently last time it came out a bunch of people commercialised it by making dongles and selling them, and the scene wants to avoid that happening again before an open source thing is released.
Well, like some of the open source community, they don't really like to see people profiting from the hard work they put in to release things to the community. It's not business to them, it's idealism.
Right, but if they're not going to release it, it's not open-source, right?
Actually, the whole contradiction goes away if the claim is a hoax, which it seems to be. Never mind.