Comment by Terretta

> it died with apple making it impossible to offer any sort of generic filesystem API or even background sync

Apple's cloud storage remained WebDAV a very very long time.

Apple's iOS has a pluggable Files system. Use Working Copy to give other apps access to folders sync'd with git: https://workingcopy.app

Or a dedicated app like GitSync: https://apps.apple.com/us/app/gitsync/id6744980427