It should be mentioned that fibers are a natural monopoly [1], that is a market were it is essentially impossible to win against the first guy in the market. This is, because the first company who lays fibers in a location has costs X for an expected revenue Y. The second company has also costs X, but only a expected revenue Y/2. And additionally the first company can roll over their dept, and can then operate at a smaller revenue. So as long as the competition is not willing to pay the additional costs for strategic reasons, it is very hard to compete against an already entrenched (pun intended) cable company.
[1] https://en.wikipedia.org/wiki/Natural_monopoly