Well, internet famous is not the same as famous, they can't just walk up to a woman on the street and say "Hey, I'm [famous youtuber] wanna sleep with me?" like someone like Myke Tyson would, they instead try to get girls through the internet, which sadly in many cases limits to literal girls who are part of their audience.
Pedophilia is most of the times an illness they are born with or that they develop due to too much exposure to sexual activity during childhood, and even then you would need a certain biological disposition. I remember the story of a demon in human form, the serial rapist-killer Pedro Alonso López, who grew up the son of a prostitute that had sex in the very next room to where he and his 12 siblings slept, and only him out of those 13 kids end up like this, primarily due to him having being raped as a kid.
The ephebophiles are a more complex bunch, they are mostly guys (or girls, we all know histories of female high school teachers doing inappropiate things) who are stuck in their childhood phase and work their way from "how can I fuck this girl without looking like a deviant?" retroactively, mainly because they cannot get a woman their age to sleep with them, or follow an "ideology" created by a deviant that wants to use it as a front to fuck teenagers, like 99.9% of the still-moving target practice that are the groypers