I'd lay most of the blame at groomers realizing the weebs are easy prey for indoctrination, greater organization among groomers, and a mix of autism and poor homelives of the young adults & adolescents comprising weebs that makes them vulnerable to indoctrination in the first place.

Weebs didn't have a troon problem in the 2000s and you didn't have evil people trying to convert vulnerable adolescents into transgenderism anywhere near to the extent they are today.