Forking Android is not an option. Android is way too complex for any company or band of open-source developers to take up. The fork would quickly fall behind Google's implementation and become effectively useless.
It is not that complex, and now that AI has gotten good it's gotten even easier.
This is so wrong. First off Linux. Secondly even among Android competitors, HarmonyOS.
Harmony is no longer Android, and it's closed source
What maintained forks of Linux are there that actually do their own general improvements and maintenance besides just following along upstream with a custom driver or two? I'm even going easy and only referring to the kernel, even though "Android" is a lot more than that.