Not for Verizon, maybe -- but Google never struck me as a bunch of chumps or wild philanthropists. I'm betting they're getting more eyeballs in front of Adsense and YouTube ads...
There's no money in building dumb electric lines or dumb sewer lines or dumb phones lines either, so the solution there was to guarantee customers in return for regulating the service.
This would create a common platform upon which video service providers could compete equally. As it stands now, integrated companies like Comcast have no incentive to make sure Netflix, Hulu, HBO Go, Sling TV, etc. work well for their customers. Quite the opposite, actually.
One day, the ONT on my floor went out and nobody noticed but me. Apparently, I was the only person on the floor (of dozens of apartments) to subscribe since the building was built 5 years ago. People on HN like to believe that what the market really wants is a fast dumb pipe for watching Netflix/Youtube, but it's a fantasy world.
The reality is that there's little money in the dumb pipes. The money is in content: in Comcast's case video content, and in Google's case, web apps and ads. Existing cable networks are plenty fast enough for video, so Comcast doesn't bother upgrading. They're not fast enough to enable the future Google envisions, where you store all your content "in the cloud" (and they datamine it to sell you ads), so they're building fiber. It's that easy to understand.
The existing networks are fast enough to service what makes the money: video services. The cable companies will only upgrade the pipes to the extent that it threatens usage of their video service.