Considering the amount of tech and self hosting types that live in cities, it seems like it would be popular to have little mesh intranets all over the place, but I’m not aware of any.
I read about NYC Mesh a while back, and I wonder if there are other similar things already in widespread use that I just haven’t heard about.
It doesn’t actually mesh tho, most Freifunk hubs are just open WiFi hotspots that provide internet access via the usual internet providers.