$20 is not a lot of money but there are people who can’t afford it anyway

Then they can’t afford a phone or monthly service plan or really any communication devices at all.

Unless you live in an overpopulated area it will be pretty hard to find someone else using that kind of device

Literally designed for rural areas with poor cell service.

it don’t have a real application

Wait the real application that I use to communicate with and manage my node doesn’t exist?

supposing someone make a business and start deploying the system for money

Yeah except this tech is already used with all kinds of smart and IoT devices.