I can understand the desire to change it given that the current name is arguably a slur in some contexts, but this is a terrible new name. There was a fork awhile back with this same motivation called “Glimpse” - I really think they should have chosen a name with some continuity from the original, and certainly not what looks to be an initialism (I never would have come to “Wilbur” on my own).

“Git” is only really a word in British English which implicitly gives it lower worldwide cultural penetration than a general English term. For most non-British programmers (and honestly I would imagine many British ones given how ubiquitous Git VC is now), “Git” refers to the software first and the pejorative second, if they’ve even heard of the latter before.

The second paragraph isn’t accurate - Android uses the Linux kernel. Hardware manufacturers typically ship their own proprietary modules, but in principle there’s nothing stopping you from running a mainline kernel image as long as support for the specific device or SoC is present. Granted, this isn’t the case for the majority of phones, but this isn’t a limitation of Android itself and you’d run into the same issue trying to run postmarketOS or really anything else on an unsupported device.

I also want to point out that there really aren’t any good alternatives to Android (and its derivatives) at the moment. Mobile Linux distributions are getting better, but at least in my personal experience and from what I’ve heard from others it’s still a pretty janky experience in comparison and arguably is only suitable for enthusiasts.