syncthing/syncthing-lite at GitHub (sorry, I am limited to 2 links per post) says:
This project is a currently unmaintained experiment. You are welcome to fork it and continue experimenting. Should you, after doing so, feel that you wish to assume the maintainer role please get in touch on the forum.
That’s what I do now. I did a few things (see https://gitlab.com/l-jonas/syncthing-lite/commits/master) and am interested in maintaining it.
I made some changes to syncthing-java (see at https://gitlab.com/l-jonas/syncthing-java/commits/master) to fix the global discovery (was using old, not anymore existent discovery servers) and to allow chosing a device from the local network during the setup instead of writing/ scanning its ID. (Do
gradlew install here before compiling in Android Studio)