> The server has also gotten too large and too complex for me to administer. I always suspected this would be a massive problem with Mastodon. I contemplated running a server, but there's no way to know beforehand when you'll be running into a limit, like cost or time. Can you really build a social network on volunteers that invest their own money and time, with little reward?
You can at least use it for existing communities and "social networks": family, friends, geographical communities, hobby- or work-related ones. To provide them a somewhat self-administered space online to connect and share photos and other info. Thanks to federation this community can have its own "space" without being isolated from the rest of the internet. Open-ness can be somewhat gradual.
There's lots of different of ways to organize funding and the ongoing technical work for such communities.
I think it becomes harder to build sustainable instances the less socially connected the admins are to the average user.