The parent comment would work better without (or rewording) the remark on bias.

I have lived in rural, suburban, and dense urban areas in my life (currently high density urban), and there is a bias on HN toward the idea that rural communities are unsustainable on their own and mere leeches on the city dwellers. That's likely true in some places, but not universally. Sustainable rural communities have exports of resources, housing, and/or tourism, that outweigh their cost.

As the parent comment describes, one model for remote communities is volunteers who work at the library because they care. The cost of everything is lower -- labor, food, matetials -- so what looks too expensive for a town might actually be fully sustainable.