Android OEMs are not in the business of writing kernels, though, and the changes they do are minimal. And their HAL/chipset code -- the thing they might actually care about as IP -- is not governed by the GPL at all, nor is any of the enormous volume of system and userspace code they write.

It's a neat initiative and might yield something interesting, but if the Linux kernel was replaced by Fuscia the ramifications are seemingly very minor. Android's many issues have never been at the kernel level.