everywhere.fraudulent.link 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.
argument #1 for why fediverse software should show domain name for all remote users: there are too many fucking lilys