I think that it is all or nothing. SONY also gets those android drives for android phones from manufacturers. And since qualcomm and SONY support OSS you get sources for some devices. But also, SONY can be a real pain in the ***. Their long awaited MM update for their Android TVs isn't exactly something that looks like it was in development for more than a year and tested before release. And they use MTK which doesnt help since MTK doesn't exactly follow google APIs.

edit: typos