They are (slowly) releasing more and more components
https://forum.sailfishos.org/t/open-sourcing-proceeding/2468...
https://github.com/sailfishos/sailfish-weather/
https://github.com/sailfishos/jolla-camera
It's still more open than AOSP
I think you mean less. Since AOSP is fully open?
> It's still more open than AOSP
I don't think this is true at all? AOSP is completely open source modulo driver blobs (which Sailfish has too) and Google services.
One can make a fully functional system, modulo drivers, out of only open-source components using AOSP. It's not possible to do this using Sailfish; the compositor, UI libraries (Silica), and most of the "core" apps are still closed source.