>>9cb14c+yn
The operating system (Sailfish OS) is a mix of components, some open and some closed. Search for "open source" on https://en.wikipedia.org/wiki/Sailfish_OS . They have said years ago that it would be open sourced, but as far as I know the Silica UI is still proprietary.
>>cbolto+0u
It was mainly the investors that didn't want to move. Many things were stagnant that needed moving. Now that the investors are gone there is a chance to move things, and slowly things are moving into open sourcing their software.