You are right, it’s getting off-topic (again after this discussion had been split up… 
). I’ll just reply to one statement:
You are getting something COMPLETELY wrong here. The only official OSes Fairphone has chosen are Fairphone OS and Fairphone Open OS.
What’s true is that ubports has chosen the Fairphone 2 as one of their official reference devices. Ubports is a community group like LineageOS and just because some day hopefully LOS will be officially supported by the LineageOS community will not mean that Fairphone gives support for it.