Fiber infrastructure is expensive.
(from Q4 2015)
"In the earnings announcement this week, Alphabet (the parent company of Google) shared that most of it’s $869 million in capital spend on “Other Bets” went to Google Fiber, according to CFO Ruth Porat, and that Google Fiber would continue to be a driver of CapEx spending going forward."
https://abc.xyz/investor/news/earnings/2015/Q4_google_earnin...