In a way, the whole thing is a byproduct of the brain’s ability to identify a face based on minimal details. It’s kind of acting like facial recognition software, albeit extremely buggy facial recognition software that’s always tagging a fish tank as your dad.
Blank also describes reasons that Pareidolia exists. This includes seeing the familiar in human development, the social aspect of recognizing faces, and the instinctive protective aspect of detecting danger.
In that sense, our over ability to see faces in inanimate objects is really a feature rather than a bug. It’s evidence of how well-wired our brains have become.