If the marginal cost is low enough, it may be profitable to give rural populations Internet at a price that they can afford, even if it's way cheaper than in California, and so low that the entire system couldn't be run profitably if everyone could get it that cheap.
SpaceX would have to run tens of thousands of what you're doing all over the world, where regulations and laws are different. It's not comparable at all.
Why would SpaceX run it? I am talking about freenets, the communities run these by themselves. SpaceX sells a station and connectivity to the group as a whole, and I'm pretty sure 600 Mbps (which conpares to nearly a hundred people watching a fullhd video, btw) is more than enough for a town - my network is still just 300 Mbps.
I think you're missing the point of spacex's business plan. First, what you're saying is somewhat common in the USA, but they have far too much competition in the USA for that to be profitable. Outside of the USA, WISPs aren't very common, and even if they were, it's a huge effort to sell your service through every other tiny company in different countries.
