I searched around, but the only thing I could find is that they've had an open issue on their issue tracker for like 6 or 7 years requesting an AppImage release, but they didn't comment on it or respond to it.

I've seen a lot of people online mentioning they would like it, and there's even someone who made unofficial AppImage builds for a short time (but then they stopped after a couple of releases).

Is there a technical reason why they won't? It seems like most big emulators offer AppImage for portable setups these days, so I'm just curious.