For me, it's pure nostalgia. It's getting to relive the past that I loved with all new hardware, getting to do things that nobody from the time period could have imagined given the limitations and pushing the limits of the software of the system. Sure the OS hasn't been updated in years, but there's a giant library of software and hardware for the system that's still a draw, and using modern technology to make it more palatable and useful is a huge bonus in addition to enabling people to experience it all again.

I mean you can run Linux on it ;)

https://www.youtube.com/watch?v=Ov6fNeijWTo

AmigaOS 4.1 fe came out 4 years ago so it’s not that ancient.

run sysinfo