@jaybird110127@dragonscave.space Activision has the "Zork Anthology" up on GOG and Steam. That's been true for quite a while now.
The existence of the ZIL sources is really not going to affect that at all. It's easy to *download* the Infocom game files. That was true long before the ZIL sources came out. Anybody who wants to play the games for free can do that.