Google has abandoned most AOSP apps. It has moved large parts of the API into Play Services. Android is not open, what is open is merely an incompatible fragment of an OS.

Google Apps Agreement prohibits you from enjoying the openness of that everything else.

And now the EU Commission thinks that this is an unfair (due to market share) agreement, because it prevents competition. (Which is trivially does, since no OEM can start making and marketing and selling a competitor.)