soc.octade.net is a Fediverse instance that uses the ActivityPub protocol. In other words, users at this host can communicate with people that use software like Mastodon, Pleroma, Friendica, etc. all around the world.
This server runs the snac software and there is no automatic sign-up process.
Now propagandists are telling people to abandon PGP / GPG altogether.
Even the #cypherpunks mailing list got the EEE treatment.
There is a slightly similar proof system via #keyoxide.