Can we host it ourselves a la Mastodon / Lemmy / Fediverse stuff?

What part of this is self-hosted?

Embrace, extend, extinguish. They’ll play nice with the Fediverse for a while. Maybe years. But then they’ll introduce a new feature to the Fediverse as a “good will gesture”. Then they’ll make features available to only people federated with Threads. Then they’ll make features only people on Threads can see. And so on and so forth. We SHOULD care where the content comes from. Platforms that are neutral should be where our content comes from.

Maybe cockpit?

Free/TrueNAS.

You should. If they’ll literally stop talking to you over an app choice how good of friends are they?

I feel the exact opposite – I feel like they encourage tinkering in their own way, since they offer the ability to much more easily roll back to a known good configuration.

I see NixOS I up vote. Looks good!