As a younger dev I often dreamed of devs releasing the source code to ancient games so that I could learn from it, but now that I know how corporate works I've made my peace that it will happen rarely or never.
I bet that devs in a company like LucasArts these days need to wait for weeks on corporate to give permission to use a alternate email client, just imagine coming up with a proposal to abandon copyright claim on something. It just can't happen, you would have a very hard time even finding one single person inside the company who might actually have the authority and pull to greenlight it.