The holes to fill with concrete pads are deep, and large in sq footage. Imagine the costs of digging them up? I think the base is about 50 feet in diameter, and 1 1/2 to 2 stories deep. To say nothing of the roads needed. When they build these on land that can support crops, they are permanently removing that land from usage forever.
That still doesn’t quite make sense. Suppose I wanted to build a building with a basement. I wouldn’t expect to need to have mineral rights to do that.