I can see my 5 year old android mobile struggling being a suitable self hosting machine… (Because of the battery).
But not gonna lie, having it working as a more advanced travel router connect to Tailscale sounds like a neat idea (which I think it is already possible? The other day I saw the client app that supports subnet routers? I just haven’t tried it, and it has a disclaimer that it drains the battery… So I didn’t end up doing that at that moment when I was away).
How did the battery last that much? AFAIK the GBA didn’t have any sleep mechanics… Or was one pack of batteries able to hold 12-24 hrs running the game non stop?