Listo factor: Planing and preparing for catastrophic keyserver network failure is a good idea. What i haven’t seen in this thread is a list of the variety of proposals for OpenPGP key distribution that do *not* require the global append-only key distribution network. Other approaches are: Web Key Directory (WKD) Mail provider publishes public keys of users via https to a well-known location. Keybase social media and other avenues for key publication, identification, and corroboration.”]
Source: https://lists.gnupg.org/pipermail/gnupg-users/2018-January/059799.html