Homes tend to have internet connections!
What if the user has a data cap?
What if the user has a misconfigured firewall?
Personally, with the exception of friends and family phones and tablets, I say "not my device, not my network, not my problem."
People will plug it into the Internet to get their little discount.
And network security is another important aspect that can be a challenge but ultimately a benefit if better network security is needed and implemented standard with a clan for iot
Of course, in a intelligent world, the local power utility would be just that, local, and only involved in the last-mile connections of power and fiber, and let who actually sends down those be handled at the central "hubs".
Then since data and power were handled by the same company, your electric meter would just have a connection to your fiber router.
This would be too easy so it won't ever be done.