For most IMs I agree, Briar is/was slightly different though, being P2P and E2E encrypted. There isn't many IMs out there supporting Bluetooth connections between users for example.
Anyone have an idea how good https://qaul.net/ is?
I saw it shared at dweb camp and it seemed like a pretty long term serious project for P2P.
Bitchat is great, but I don't understand why it's Bluetooth only. I would think Wifi reaches further.
Being p2p, network effects are even larger: you have to convince not only your own friends to install and use, but also rely on enough density in your area?