Is it free software?

If one likes to conquer the hearts of the free software community, one has to be compete with the existing systems. So be a little bit more open than Android, at least. E.g. I'm using a Samsung telephone with CyanogenMod and no proprietary Google addons (no Google apps, mail, etc.). There are, unfortunately, still some non-free drivers, but the everything else is free. If Jolla would be at least so open, that people can practically port or fork it, it might get some positive feedback in the free software world.