That doesn't answer the question with any sufficient detail.

Sahara sand is not as good for construction, but for filling in "standing pools of water" or alligator habitats it could be just fine!

After all, if it's not being used for concrete and chemical bonds are not being formed for construction, then fine round sand can probably do just as good a job of lying there as larger square grains.

But I suppose construction is far larger than other uses and that wouldn't lower the issue enough.

There is far more sand in deserts than is used for construction.