Desalinization is really expensive and difficult to do in large quantities. Pretty much, its low on the list of options compared to just about everything else. Outside of very specific areas (such as some in the middle east with no other options) its still a better option to do any other method over desalinzation.
Also, geography. Transporting water is really inefficient, so unless you’re staying a small area or along the coast, getting the water inland is a big problem. We’re generally no where close to having it be effective to do this
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