Is its foundation the 3.5 SRD though? I thought SF was based on PF2, which is not based on the 3.5 SRD as PF 1E is.
(I’m fully prepared to be proven wrong on this point. I haven’t followed Paizo products close enough to be sure of the timeline.)
Including the OGL for PF2, to my understanding, was basically a CYA move, as it couldn’t hurt. The license is perpetual, right? Plus it then allows people to create content based on their own PF2 SRD.
Now even if SF is 3.5 SRD derived (and therefore using the OGL 1.0), Paizo could still remove the license from it, establish the ORC license, then create their own SF SRD and offer it using the new license.
It’s possible WotCbro might go after them for copyright infringement at that point (or maybe breach of contract if the OGL 1.0 is still standing then? I dunno, IANL), which might get interesting.