that’s a bit pendantic, there exists such a thing as suburbs. even some rural communities are perfectly reasonable in terms of municipal infrastructure. but we are specifically talking about houses that are miles and miles from the next house that is then miles and miles away etc
Even in "rural regions", there are typically some small towns where infrastructure could be provided to them decently efficiently. It's when every single house is a good distance away from their neighbors that things like running fiber cabling become grossly inefficient.