The problem with virtually all technologies that utilize existing copper infrastructure that was built to deliver analog phone service is that it degrades sever

The problem with virtually all technologies that utilize existing copper infrastructure that was built to deliver analog phone service is that it degrades severely over distance and is heavily dependent on the quality of the cabling. Analog voice quality degrades linearly. It doesn't suffer significantly from splicing, repairs, or bridge taps. For data services delivered over these lines, these factors can be catastrophic.