For production? I am not sure, but the playtesting server runs on a Digital Ocean droplet that has 2 gigs of ram and chugs along just fine. The game is very minimal in the CPU and ram requirements (simple data structures, nothing overly big, single tiny mongodb instance, simple number crunching and data evaluation at each decision point (with no expectation of concurrency)). On my 2016 macbook, I can run the entire test suite in 3 seconds (parallel), so nothing that’s happening internally requires any serious horsepower.
I bet you could run an instance on a personal computer for your entire local community and experience no issues.