Both tantalizingly close with respect to GrapheneOS. I wouldn't expect Samsung to ever support the other two, but their phones are supposed to have every security element GOS expects. Only problem is that Samsung wants to make their own walled-garden ecosystem a la Apple.

I do remember reading somewhere that GrapheneOS are open to someone making a GSI (generic system image) port that would work with phones like Fairphone, which GOS don't want to officially support due to a lack of security features. I wonder if anyone has started work on such a thing.