There are probably at least two factors, as someone who is unfit to comment this confidently on the question.

On the one hand you have a coming of age of kids who were exposed to a high dose of Warner Brothers smut.

Many of them are coming of age at the same time as the internet, making it easier for a niche community to form or be found and grow.

This seems totally plausible but again, I’m bereft of actual knowledge on this topic and I’m at least partially trying to provoke someone better fit to the question to educate me.