What for? Running on a closed system there is no point to begin with.

They have provided reproducible builds for almost a decade https://signal.org/blog/reproducible-android/ https://github.com/signalapp/Signal-Android/blob/main/reproducible-builds/README.md

I would recommend Arch, but only to users who want to learn and understand linux and have the time to do so.

Git - the Github Desktop application is a great example of how easy git could be for users like me who only rarely use git. Every time I need to do somethign other then a simple pull or push I need to look it up and by the time I need it again I have forgotten the command and need to look it up again. Just give me something like Github Desktop on linux

Before Github, there was no collection of open source repositories that are easily searchable, making it easy to find and promote open source software. I am not aware of any alternative that ever did or does a better job at making open source contributions that easy. Even when I try to use codeberg as an alternative, my Github repos will always get more contributions. No idea how we could even begin to change that.