The Google Fiber Privacy Policy seems relatively strong in the "Google Fiber Internet is a dumb pipe" sense:
Technical information collected from the use of Google Fiber Internet for network management, security or maintenance may be associated with the Google Account you use for Fiber, but such information associated with the Google Account you use for Fiber will not be used by other Google properties without your consent. Other information from the use of Google Fiber Internet (such as URLs of websites visited or content of communications) will not be associated with the Google Account you use for Fiber, except with your consent or to meet any applicable law, regulation, legal process or enforceable governmental request.
Technical information collected from the use of Google Fiber Internet for network management, security or maintenance may be associated with the Google Account you use for Fiber, but such information associated with the Google Account you use for Fiber will not be used by other Google properties without your consent. Other information from the use of Google Fiber Internet (such as URLs of websites visited or content of communications) will not be associated with the Google Account you use for Fiber, except with your consent or to meet any applicable law, regulation, legal process or enforceable governmental request.
https://fiber.google.com/legal/privacy.html
(Google Fiber TV, not so much)