Your comments reminds me of “ Falsehoods programmers believe about addresses”
https://gist.github.com/almereyda/85fa289bfc668777fe3619298b...
Amazon Sidewalk can also be used - it automatically finds devices on other networks (like your next-door neighbor) and sends data through their devices in case you don't connect your device to your own network.
Products are often cheap enough that the labor costs are too high compared to getting a new unit. It would generally work for appliances that are built into a house or hard to transport because then the relative cost would be offset by the cost of labor to remove and install a replacement.
For example, people generally wouldn’t do this for a TV when they can get a decent replacement for $300 new.