There is a good usecase for devices like these: companies that place orders remotely with a large variety of suppliers. For instance, if you have a website where you allow people to order take-out food you could place one of your printers at their premises. No need to rely on their infrastructure at all, especially not if the device has it's own cell modem on board.
I spent a couple months working at a company that had almost that exact business model. We just used normal, cheap, thermal receipt printers attached to a Raspberry Pi.
