Seems like an interesting effort. A developer is building an alternative Java-based backend to Lemmy’s Rust-based one, with the goal of building in a handful of different features. The dev is looking at using this compatibility to migrate their instance over to the new platform, while allowing the community to use their apps of choice.
Not to mention a lot of massive companies also use it at every part of the stack, Rust is good at it all and it is beautifully and perfectly suited for tasks like these.