When written language was scarce, holding the information was powerful, and it was only the powerful who had access to literacy.
As recorded information became more common, it had to be organized in some way, but notice that there is no natural way for information to be organized! Therefore those who organize the information are those with power, and their choices reify that power and their biases.
Recorded information could also be obscured, or destroyed, and whoever had the ability to decide that also had a lot of power.