Mesh networks are useful as a quick way to make a fully decentralised communications system which is not connected to or reliant upon the internet. Think festivals, hacker conferences, onboard ships at sea, disaster/war zones, small businesses who don't want the overhead of server maintenance, protests, remote areas of the world, temporary "digital blackouts", scientific expeditions and off-world space colonies.
Mesh networks are useful as a quick way to make a fully decentralised communications system which is not connected to or reliant upon the internet. Think festivals, hacker conferences, onboard ships at sea, disaster/war zones, small businesses who don't want the overhead of server maintenance, protests, remote areas of the world, temporary "digital blackouts", scientific expeditions and off-world space colonies.