Dev update: I intend to continue improving and maintaining Eternity, and I have no plans to abandon it.
Good news, it seems that the app is still alive and its developer has not abandoned it, as commented by its developer in the official Eternity repository.
Just like Lemmy instances with only a single admin, Lemmy apps with a single developer are very fragile. What would it take to improve the bus factor of Eternity?
It doesn't seem like the repository has that many contributors to begin with, so I would think the answer to improving the bus factor begins with getting more contributors.
Something that might help bring in more people is making it easier for a new contributor to build it locally. I don't enjoy dealing with Java/Kotlin projects because the tooling is pretty messy when compared to the tooling for Rust projects. Perhaps a dev container and/or a Nix configuration might help with making that easier? I know it would for someone like me.