IMO one part of the problem is those outside groups going "lol Superheroes are trash" and trying to morph them into whatever they were doing on the outside of the Big Two. We've had a handful of posts from indie creators who are far removed from it that jump on the train of hating the Big Two's audience for rejecting Riri Williams, Jane Foster, America Chavez, nu-Iceman, etc. usually under the argument of "creators should be able to do whatever they want!"
That's not blaming them of course. More my belief that some people get carried away with their stance on capeshit that end up supporting people shrinking the industry as a whole.