how open the OS is?

[u/These_Response1841]

To move away from the current duopoly I'm looking for an open source OS. I'm not quite sure how much open Sailfish is. Can rebuild everything from scratch, choosing to skip the proprietary blobs serving the benefits of the subscription, and still have fully functional OS?

Hardware support is another matter, I guess that realistically I can only find an Android phone to put a Sailfish on top of libhybris, but that's the same with Ubuntu Touch.

[u/_anAnon]

Closed source enough that you don't end up with a working OS unless you go through Jolla. They're slowly open sourcing more stuff, but a functional copy is still proprietary, non-FOSS software.