I think that user donations are easier when an instance has a good focus. There are some other instances I can think of where the donation model has been enough to cover things. In addition to feddit.dk and beehaw, an instance I use most of the time, ani.social, is more than covered by donations last I checked. It looks like @hitagi@ani.social even took away the donate link in the sidebar. Never mind, I am just blind. I didn’t notice the little Ko-fi badge at the bottom. I was looking for a text link.
I have hosted a wordpress site on my unraid box before, but ended up moving it to a VPS instead. I ended up moving it primarily because a VPS is just going to have more uptime since I end up tinkering around with my homelab too often. So, any service that I expect other people to use, I often end up moving it to a VPS (mostly wikis for different things). The one exception to that is anything related to media delivery (plex, jellyfin, *arr stack), because I don’t want to make that as publicly accessible and it needs close integration with the storage array in unraid.