That’s what the subsidies are for. Plus, fiber does not necessarily need to be upgraded after installation (especially rural, where there’s less customers in general). It’s not copper or coax, it doesn’t have the same limits, and can usually handle huge amounts of data (the limit primarily being the transceivers at both ends). The costs of upgrading would also likely be lower than the initial install, something that couldn’t be said about providers like Starlink. Fiber is about the most efficient, cost effective (especially in the long term), and future proof way to provide internet. Starlink is overall much more expensive to maintain.

But yes, without the local, state, and/or federal governments supporting it, people in rural areas won’t have a choice.