This doesnt stop you from tinkering or anything of the like. Its meant to stop a business trying to piggy back on a residential service. Just feed their FAQ

https://fiber.google.com/help/ : Can I run a server from my home?

  Our Terms of Service prohibit running a server. However,
  use of applications such as multi-player gaming,
  video-conferencing, home security and others which may
  include server capabilities but are being used for legal
  and non-commercial purposes are acceptable and encouraged.