Dave told his mom.
Dave's mom told her friends about it on Facebook.
Dave's mom's friends told their spouses (if any).
Dave's mom's friends' spouse's told their son(s) and/or daughter(s) (if any) about MPGH.
Dave's mom's friends' spouse's sons'/daughters' surfed the website at school.
Dave's mom's friends' spouse's sons'/daughters' school administrators saw this, and told other IT staff.
Dave's mom's friends' spouse's sons'/daughters' school's administration's IT staff told their spouses (if any) and their children (if any).
Google saw all of these searches for something called MPGH, and said "DAFUQ?".
Google's SEO was told of MPGH's existence.
Lary Page paid the NSA 1 billion dollars to find out who owned this website.
Lary Page offered Dave to boost his SEO ratings, in exchange for some traffic (Google Analytics) analytics.
Dave spread the wealth among his Admins and Mods - they all lived in a mansion, happily ever after