The Moon truly was not suitable for human habitation. Though the Inhumans were generally physically stronger than humans, they were still flesh and blood. As long as they lived, they had to eat, drink, and answer nature's call.
Food alone was a problem.
On Earth-40K, Su Ming had a trade partnership with Attilan. He obtained some Kree technological creations from the Inhumans, while trading them goods such as fruit, snacks, and everyday necessities.
Judging by the scale of the city ruins here, this place probably had never been much of a grain producer.
The city of Attilan had been converted from the Blue Area. It had never been large, and its space was limited. Although its advanced technology could ensure an adequate food supply within that limited area, that was only adequate for the living.
Normal people had a limit when they ate. Once they were full, they could not eat another bite even if presented with exquisite delicacies, or they really could burst to death.
Zombies were different, especially Hunger Zombies. Driven by hunger, they would eat without end. So long as there was something edible in their sight, they would absolutely cram it into their mouths before one of their kind could take it.
Speaking of this zombie Earth, in the comics, the infected Avengers heroes initially did not want to eat living people. Instead, they planned to eat the other Zombie Heroes to save Earth.
They captured other zombies and took a bite, only to vomit up bile because the flesh tasted so awful.
Captain America refused to give up. He thought it might taste better if it were cooked, so they captured more zombies, carefully prepared them, and used plenty of seasoning.
But cooked zombies tasted even worse, especially since the zombies still were not dead