It is a bit hard to be an aspiring FOSS contributor given the foundations those contributions are built upon.
Those same Apple loving users would be laugh upon at FOSDEM if they demoed any of their stuff on Windows instead.
Yet, there is hardly any difference between those corporations going all the way back to their origins.
Somehow after NeXTSTEP's adoption as OS X, NeXT and Apple's proprietary behaviour was forgotten and everything excused, because "hey they are shipping an UNIX clone"!
How would that work? When you build a house on rented ground the house may seem to be yours but it can always be taken away from you.