Android forks in China are not undermined by the lacking open driver support for Android.
There's a bunch of SBC manufacturers (pine64, odroid, orangepi, etc) worldwide that have managed to compile AOSP for questionable hardware. However, it is noteworthy that almost none have been able to compile images for Android 7.1 and above that work without hiccups.
Are you saying that simply because a multi-billion dollar company with top engineering talent is able to compile a version of Android that this disprove the comment you're replying to?
There's a bunch of SBC manufacturers (pine64, odroid, orangepi, etc) worldwide that have managed to compile AOSP for questionable hardware. However, it is noteworthy that almost none have been able to compile images for Android 7.1 and above that work without hiccups.