I feel like the idea here is cute; but does it realistically work at scale? Of course, a messaging app like this—if it's going to work anywhere, is going to work in Gaza, one of the (at least formerly) most densely populated areas in the world. But bluetooth was not designed for this type of communication whatsoever; phones can only establish bluetooth connections between devices at the very most 100ft under the most ideal conditions; and is probably much lower than that in practice.

Even if people are living in open-air conditions I can imagine messages getting stuck or being delivered very late; especially at night when there may not be a lot of human movement. How well does this actually work in practice?