That's a nice gadget, that's it.

You won't use it in the real world when something like that is really needed, because nobody else around you has one.

Plus: your cellphone will barely last one day even in standby mode and you will soon discover that coverage for that thing is god-awful with obstacles between both parties. We are talking about a reach of 30 meters, you might as well be shouting to your neighbors instead of using fancy devices.

Real-world useful tech are sneakernets. 

 Sounds like you’re imagining a post-apocalyptic world 

 Scarce need to imagine far away, that kind of world happens today around the globe when you look with attention. A few eastern parts of Europe included in present.

Imagine yourself with geo-blocked internet access, unable to fetch stuff from aliexpress and troubles to even keep your phone charged with power.

Sneakernets become more useful than LoRa clouds. 

 Is sneakernet with deadrops on LXMF a better solution? 

 Haters gonna hate