Announcement by the creator: https://forum.syncthing.net/t/discontinuing-syncthing-android/23002
Unfortunately I don’t have good news on the state of the android app: I am retiring it. The last release on Github and F-Droid will happen with the December 2024 Syncthing version.
Reason is a combination of Google making Play publishing something between hard and impossible and no active maintenance. The app saw no significant development for a long time and without Play releases I do no longer see enough benefit and/or have enough motivation to keep up the ongoing maintenance an app requires even without doing much, if any, changes.
Thanks a lot to everyone who ever contributed to this app!
Sounds like the original maintainer is tired of maintaining it, and the amount of community support wasn’t enough to justify continuing to put in the effort. And then Google’s packaging process pushed it over the edge, hence retiring the project.
The fork is just another person deciding to take up maintenance of the project.