We give companies like Netflix and Akamai free access to space
  and power in our facilities and they provide their own content
  servers.

  We don’t make money from peering or colocation; since people
  usually only stream one video at a time, video traffic doesn’t
  bog down or change the way we manage our network in any meaningful 
  way — so why not help enable it?

  But we also don’t charge because it’s really a win-win-win situation.
  It’s good for content providers because they can deliver really
  high-quality streaming video to their customers... It’s good
  for us because it saves us money (it’s easier to transport video
  traffic from a local server than it is to transport it thousands
  of miles). But most importantly, we do this because it gives
  Fiber users the fastest, most direct route to their content.