Big city mandatory valet comes to my mind.

Sorry, but your questions are difficult to understand. Could you please clarify what you are researching? The fediverse isn’t some metaphysical thing.

What is your curiosity?

My lemmy.fan instance died. Something broke with federation and I’ve never been able to get it running again, even with a new database and a new subdomain. I gave up for now, at least until better error checking and recovery is implemented.