That's too bad. Anyone know of a fork or similar project? Maybe Meshtastic/MeshCore/BitChat. Berty Messenger's last update on iOS was in January 2025.
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Instead of a fork, there is completely new development going on here: https://github.com/geograms/aurora
BLE/LoRa/radio/internet mesh with reticulum that combines chat, social and torrents over NOSTR (decentralized protoocol).
Still beta, around August should be stable.
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https://docs.cwtch.im/ has P2P Onion Service based messaging.