Yeah, I completely agree. As someone who has been reaping the benefits of blender for years now I definitely love the open source model.
I was just under the impression that paid tutorials or addons for blender can still be produced since blender itself isn't being edited and distributed in those cases. That's why I was wondering whether or not it's the same for ZAnatomy.
Now I see that it definitely helps to see ZAnatomy as a product of its own that is allowed to be distributed but not to be owned by anyone, rather than a product provided, edited and locked off from others
Ultimately I think it's a business decision. If someone wants to make sure that people don't make money on the product they paid to develop, I guess it's in their rights to want to protect it.
I'm going to pitch it to them anyway and they'll have to decide which direction to go.
I would definitely like to have more eyes on this project though, it's really cool