Dark fiber (unused fiberoptic cables) is a confusing term for me. Why would any company build so much excess capacity? Such a business decision seems unwise. There are even companies that brand themselves as 'dark fiber providers' which is even more confusing.
Was the expectation of utilization massively overestimated? Or is switching and multiplexing tech rendering it cheaper to use few fibers?
I realize this is not technically an EE question but am hoping that some real EEs have insight into why this has happened. If the mods feel a different forum is more appropriate I can move this post there.