1) They are controlled by aliens from another universe.
2) The ancient Egyptians are in control and use Hieroglyphics to explain where the information is.
3) To make indie publishers frustrated.
But the likely answer that pops out. If an indie author is will to dig to find the information, perhaps they will be best sellers as well. Writing and promotion takes work. Boy they sure make it hard work. So now I am reworking the formatting on both of my books, this has caused a delay on my current novel. But at least it will be done right the first time.