The Earth's constant rotation means you've got to have some serious firepower to get a signal to the lunar orbit. But building a global network that powerful would be incredibly expensive. It turns out those same monster dishes used to study things like distant galaxies and black holes aren't super useful when the Moon is out. The Moon's thermal heat and light flood the night sky, making it more difficult to study; consequently, those giant radio dishes often have more open time. So Intuitive Machines rents those dishes during their lower demand periods because radio waves don't care how bright the Moon is. Sharing expensive toys vs buying new ones = win/win