Syncthing-Fork is apparently fine.
I had freaked out over it briefly but someone had linked to proof that the handover was legit: https://old.reddit.com/comments/1tfldu7 (Yes, I know linking here is that-which-shall-not-be-done-on-Lemmy but the discussions were interesting and are worth reading.)
With that said, I actually like BasicSync's design more than -Fork anyway so I'm sticking to BasicSync for now. I think either is fine.