This has always been a head scratcher to me too…
I understand the convention of approval for using “part” of the Genesis mesh for the Geo-Grafting endeavors of both commercial, and freebies for distribution.
What I don’t understand is any kind of stranglehold on content creators that is stifling potential releases, and furthering the use of, and popularity of Geo-Grafting.
It is not necessary to use any “part” of Genesis for Geo-Grafting. The only caveat is the newly created mesh (from scratch; from one single vertex even) must be coincident located to be used for the grafting (easily done).
I have a simple sci-fi freebie in mind that I want to eventually create, but if I am going to have to go through some B.S. song-n-dance to release, or suffer some sort of cease and desist (like WERTS; and yes, I am well aware of the true violation. I side with DAZ on that one), and have my work pulled because DAZ did not authorize it.
I can create my work from scratch, from a single plane, or hell, from a single vertex, and create from scratch that first plane.
You can create yours just the same, and would not be in violation of using any DAZ mesh. If you don’t know how to bring your mesh within coincident location, I would be happy to teach you. I say go forth, and create your vision.