Please, take a look also at I2P and Reticulum.
Do they have enough nodes these days? That was a big issue back then
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I2P? Definitely enough nodes. I use it daily.
Or did you mean Nostr relays on I2P? I don't know about this.
If you meant Reticulum, then I don't know.
Sideband's UI isn't great. But Reticulum is E2EE and can do much more than Bitchat: Bluetooth, WiFi, LoRa, etc.