Its already happening with Amazon Sidewalk and LoRa bands.
Some of the larger ISPs are also piping cell phone communications to VOIP at the edge using built-in features in the modems, and these are hopelessly insecure by regulatory action.
Take a look at the Cypher-Con talk on cable modems. Pretty damning. (https://www.youtube.com/watch?v=_hk2DsCWGXs)