Is it open source or open sourcey?
Open sourcey is read-only for everyone outside Google, Google greatfully receives all code donations and bug fixes but is not obliged to do anything with them, then adds its own binary blobs and spits out a product when it wants to. If you try to build from source yourself you will probably lose compatibility because you don't have the all-important binary blobs.
See also: Android, Chrome, Fuchsia.
Biting the hand that feeds IT
