For the same reasons someone would maintain a forum or some other sort of what we call today "social networking service;" to allow people to come together and c

For the same reasons someone would maintain a forum or some other sort of what we call today "social networking service;" to allow people to come together and communicate, sometimes focused around a certain topic. Few people will make a living from running a fediverse server but if you have enough of a dedicated audience, you can probably at least fundraise enough to help cover costs.