I dont think you should give up X! Not after all you've put in here... look at it like a car company, sure, other companies steal their ideas to improve their own product, and that is basically what is happining here.
It's not easy to see something you work so hard on be ripped apart and sold for little or given away, but lets face it, no matter what we do, SOMEONE will still be there to rip and steal ideas. I'm sure it cant be easy for them with incripted documents but they find a way to do it anyway, and they will find a way with any other CMS as well.
With your knowledge of nuke I am sure we can come up with ways to at least make it harder for people to rip them? Or fight for tougher laws, after all, it is copywrighted work, surly there has to be something someone can do to punish the people who take it on them selves to steal.
Dont give up X.

Wouldnt be the same without u.