The instinct that leads the domestic cat and the wild felines to bury their own excrements is not dictated by hygienic questions, or at least does not depend only on them.
Scholars believe that this habit is due to the need to hide their own traces and thus make their presence less evident to other animals. Faeces are in fact an important source of glandular secretions and pheromones, which - if left on the ground - would unequivocally signal the presence of the feline to other animals; it would therefore be a disadvantage, both with regard to prey and any predators.
For the same reason, when the feline intends to mark its territory it tends to evacuate the faeces to its borders without burying them. This behavior is typical of dominant males, called alpha males, while subordinate felines tend to cover their feces.
The domestic cat presumably buries its droppings because it feels subordinate to the human family.
