Comment by ajsnigrutin

The idea is great, but the adoption rate is way to low for any P2P thing to actually work (unless with agreed upon meetings).

Meshtastic is a better option, because it uses LoRa (thus requires additional hardware), but with a good location, many kilometers can be covered and mesh networking extends this a lot further. Meshcore is supposedly the next "generation" of meshtastic, but not popular enough over here to actually test it.