If there's a single company with a forever long track record of half-assing products and never finishing them, only to cancel them later with disregard to current customers, that's Google.
They make so much money that nothing really matters for them.
While a private company has to pay for the usage of the public property too. It has also to work on the allowance to use the public property at all. Also the construction costs are much higher, as they cannot share with other infrastructure costs. If private companies wants to share the costs of infrastructure work, it requires much more coordinating work. They also need to know way in advance when which infrastructure work by which private company is planned to be able to work together. That will become a bureaucratic mess.
In Norway the fastest growing deployments of fiber is done by regional power companies in cooperation with a services provider (data, VOIP, IPTV etc). This because the power companies already have poles and pipes that they can run the fiber along.
Bullshit.