Like other comments have pointed out, I think of this as similar to how Google controls the Android OS. While theoretically open, the real useful stuff on top of Android (Google services etc) require a license from Google along with their Play store, so Google makes revenue from there.
Certainly more open (edited) than the Apple ecosystem, but still controlled by one (big) player, with a little bit of flexibility but not a whole lot.
Certainly more open (edited) than the Apple ecosystem, but still controlled by one (big) player, with a little bit of flexibility but not a whole lot.