Earlier quoted context omitted.
AOSP dev went private, and Google is slower and slower at releasing the source, now twice a year. Worse, many stock apps like the Dialer and Gallery went closed-source years ago. But the source isn't the point, it's the governance. Just like Chrome, having the source is not enough to guarantee an open platform. Sure you can disable telemetry flags. But you cannot afford to maintain an important feature Google wants t…
The problem is, if you cannot afford to maintain it, how could you afford to both build AND maintain your own version of it?
But I agree that it is a significant endeavor. But the OSS community succeeded in similar projects before, and the current state of the Linux desktop makes me hopeful.