The establishment doesn't want metal to become mainstream because it would reshape society entirely, from politics to the market and culture in undescribable ways, the "big" fish want metal to be in the shadows of pop, rap and other pawn factory genres.A dozen of massively popular metal bands would be enough to change the world for better like never before, maybe even to the likes of 1960s counter culture.
metal was popular and well into the establishment at some pointit simply got dull at some point, and metalheads became basement dwellers into more obscure, heavier, edgier, anti-normie shit, which obviously scared most peoplethe establishment doesn't care about metal now because it is nothing but basement dweller retards creating noisy garbage music that deep fries brains into becoming mush and braindead, most of the civilized world doesn't want that since they are not mentally challenged