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What about places with plenty of water, but where the water's all polluted?

Then you don't need to extract water from the air. Just make it potable.

Depending on the type of pollution, making it potable could be just as hard as distilling it.

Distilling still easier and more efficient than condensing water out of the air.

Then you just put it into a pot, hook up another pot with a tube, then set a fire under the first one. Basic distillation isn't rocket science.

Energy costs are the major limiter to desalination and the availability of water more broadly. One or two people can do that but if an entire civilization does it they'll clearcut their forests and make the air unbreatheable. Cooking fires are a major source of air pollution in many Indian cities.

I think these systems were always intended for small scale use for detached villages and whatnot? I don't see a way they would be able to provide for city even if you made hundreds of thousands.

If you want to support a civilization you better switch to something that can exploit the volume for increased efficiency, like an actual desalinization plant and a solar concentrator powerplant to run it.

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