I have VPSes at Hetzner for Mastodon and Bookwyrm. I'm also using Hetzner nameservers with pseudo DynDNS.
Mail is managed by 1blu with my domain.
Everything else is at home. I would move at least bookwyrm into my home server, but there's another admin involved and I'd need to give them limited access to the VM and Proxmox (backup/snapshots/rebuild when doing maintenance).
Yeah I think I've seen some recent commits on his GitHub profile as well. He seems to be "back", just not on kbin.
I hosted my own kbin instance for a while as it seemed interesting, but admittedly I never really got into it. Still a cool approach, just not for me.