Jack Dorsey just Announced Bitchat(A secure, decentralized, peer-to-peer messaging app for iOS and macOS that works over Bluetooth mesh networks) Licensed Under Public Domain.
I don't trust Jack. But this does seem marginally interesting. Actually decentralized, no servers supposedly. We'll have to see. Again I sure as hell I'm not going to trust dorsey. And he's got it under some cringey edgelord "unlicense" license which basically appears to be MIT just with a different name. The actual concept seems intriguing. But definitely nothing to get excited about currently.
He used different terms in different places. And to be frank, I'm not sure I'd heard about unlicense before. But upon closer look it does seem to be a the goal. Despite not being valid or applicable in a few jurisdictions.