What is?
The issue with FTTH is the build can be very expensive, you need to either work with an existing utility or dig trenches through an entire neighborhood, and each end user install is a mini construction project.
Thats why community FTTH makes a lot of sense, a small team does that negotiation with the utility, and uses that to be build a business case.
form the price of internet service. That said, one of the really nice things about fiber deployments is that they need a lot fewer upgrades than coax. Fiber has way way way higher bandwidth, so once you've deployed it, the maintenance is cheaper than coax where the ISP has to do a ton of work to shuffle around bandwidth caps.
Or do you think the price paid is too low to support ongoing maintenance? In which case ... that doesn't appear to be the case from other FTTP providers that have sprung up over the years ... it points to price gouging from monopoly incumbents.