It's not one corporation, it's at least two. Joyent did basically the reverse thing. They took KVM, a Linux-derived GPL module and put it together with the CDDL

It's not one corporation, it's at least two. Joyent did basically the reverse thing. They took KVM, a Linux-derived GPL module and put it together with the CDDL illumos kernel. They lawyers analyzed this situation and vetted it okay.