Fiber isn’t available everywhere because it’s a whole new buildout. Only about 25% of the US currently has access to direct fiber internet connections. It’s probably coming to your neighborhood, but thanks to the high cost of laying fiber-optic lines and delays by local bureaucracies, it won’t be overnight.
Unlike telephone and cable lines, fiber hasn’t always been available to businesses and homes—at least not directly. The core, or “backbone,” of the internet has been based on fiber-optics since the 1990s, but direct connections to offices and houses are a recent development.