What does it take to run a good relay?
Beyond hobbyists, which companies do you think would provide a good service as a relay?
Discussion
Cloud provider like AWS, if you have a local server I would advice you to use that one. Here is a link of a tutorial how to setup one github.com/cameri/nostream
For now, I think most single server relays are limited by the hardware and network architecture. A federation of strfry relays can provide users with greater visibility to notes outside a single relay; while nostream is easy to get started and host intra-relay conversations.