> (NetBSD developers not committing code to fix bugs in
> NetBSD's tree but fixing them in Wasabi's).

This is exactly the type of thing that the GPL prohibits.
And one of the few things that Linux gets right that BSD
gets wrong.  This is a major reason why Linux gets so
much more corporate support than BSD.  Company A can
contribute things to Linux without worrying about Company B
taking them, adding Company B's ideas and selling binaries,
but not sharing the source for Company B's ideas with Company A.

This also hurts BSD because BSD cannot use any source from Linux.

So we have this situation where everyone else can take things
from BSD, but only rarely does anyone give anything back.
And then people wonder why BSD doesn't have any features.

Solution: Add the GPL to BSD.