rural life can not be sustainable.

Cities need farms to feed the inhabitants of the cites, farms can't exist without farmers (yet) and there's plenty of types of businesses farmers need to visit fairly frequently in order to live. This creates and sustains the small farm communities the dot the rural landscape between large cities

move out of city for cheap house etc - than complain about no wifi, no doctors etc - force government to have fiber internet - yadda yadda

Farmers need services too. Are you just saying everyone unlucky enough to be born outside of a major metropolis must go without medical care or access to modern services?

Also fiber is literally cheaper in the long term. It has effectively infinite bandwidth, requires no maintenance except repairing damage by excavation/natural disasters/wildlife (which any kind of utility line requires) and can run literally hundreds of kilometers without any repeaters or anything else to maintain the signal inbetween.

ISPs were (and still are in many places) utilizing worn out, sometimes over a century old telephone and cable television infrastructure to deliver internet to places that hadn't yet gotten fiber, and it perpetuates a digital divide that prevents kids growing up on farms from accessing services that might help them be the most productive members of society that they can be

people who advocate rural areas are just big egoists and ignorant

I think you're the ignorant one in this case