SimpleX Chat is an instant messenger that is decentralized and doesn’t depend on any unique identifiers such as phone numbers or usernames. Users of SimpleX Chat can scan a QR code or click an invite link to participate in group conversations.
-privacyguides.org
It’s clearly proving to be the most innovative technology when it comes to decentralized communication, in my opinion.
I saw a user’s hash just this week — it was in a ransom note. They required their victims to sign up for the service and text a code to their userhash to kick off sending the attacker cryptocurrency so they’d send a decryption key and not make stolen data public.
Other than that use case, it hasn’t picked up many users that I’m aware of.