"... I think this may have to do with rural stores having essentially consumer-grade internet routers connected to ..."

It has to do with refrigerators reachable on the Internet.

If the refrigerators were not reachable on the Internet, none of this fragility would exist.

The fragility of refrigerators reachable on the Internet was demonstrated just a few weeks ago. These refrigerators were left connected to the Internet.

This lack of discernment and misunderstanding of risks and fragility will not be solved with a better router or a different uplink.