>would force us to abandon IP address and DNS based systems such as federated ones.
Hey I hate the DNS like the next hacker. I think we can migrate to Tor HiddenServices and use Onion URLs for our mitra instances---if the need be. Afaik, mitra allows tor-only instances (they can federate to other onion instances, and/or to the clearnet ones over the tor exit nodes).
Definitely checkout mitra.social.
cc: @silverpill