I can think of a few whys: * They may find it easier to work with hardware vendors when they all aren't subject to the GPL * Oracle * The non-system calls ov

I can think of a few whys: * They may find it easier to work with hardware vendors when they all aren't subject to the GPL * Oracle * The non-system calls overhead in Linux that may not be suited for mobile phones * Wanting to better couple the OS with the hardware, and not have to run in a VM on top of the Kernel * Oracle * Changing business philosophies as they start building out their own hardware * Oracle * Wanting stricter control of the OS application stack * Protecting proprietary hardware components without using blob drivers * Did I mention Oracle?