If you think there is a rural/urban problem with optic fiber, you are jumping from the frying pan to the fire with LEO satellite constellations.
That's because an LEO satellite constellation has to cover the whole world (or almost all of it) to be able to cover any inhabited area at all. Thus it has to cover oceans, large roadless areas, deserts, mountains, etc. At least with optic fiber you only have to cover roads.
Note that high density areas can cause trouble on the other side -- you need to support the highest density worldwide that you support anywhere. Note that users in a place like New York City will generate noise affecting satellites 1000+ miles away, so if you don't ban people setting up accounts in dense areas, it will have to be priced so high that people with a lot of money looking for a backup connection will be priced out.
I am highly skeptical that the economics can work out for an LEO constellation.