[sobkas]

Google doesn't provide "entire operating system source code", it provides some parts, while other they keep closed. Also they are continuously removing parts that are essential from AOSP (that are either open or closed).

Removing support for Pixel devices makes AOSP even less useful for developers, because belief that VM will be a good replacement for real hardware test environment is a fairy tale next to sleeping beauty.

So no, they don't provide "entire operating system source code", what they provide is a caricature of open source project. So maybe they should call it COSP.