On Fri, 8 Apr 2016 00:11:28 -0700 (PDT), Uncle Monster
wrote:

Many companies, banks and educational institutions are buying dark fiber in order to set up their own networks. I've a feeling that banks like the security of having their own network and not having to send information over The Internet. ^_^

http://www.wisegeek.org/what-is-dark-fiber.htm

[8~{} Uncle Fiber Monster

It used to be all that way before the internet and they ran on leased
4 wire. That was very secure but expensive. I remember on the early
90s one company was leasing space on a TV cable, getting the
equivalent of a T1 line and the question was, "how secure was that"?
In those days it was pretty secure because the hardware to extract
that data was pretty rare but it was going to every set top box on
that node.