I think your analysis is close to correct but missing an important point. Cultures you’re talking about strongly push progresivism, to the point that traditional shows look more like hour-long Public Service Announcement than a show. It’s overcharged with girls who take the lead (even in action movies that are still mostly watched by boys) as a way to push a cultural change, but also cluttered with constant disparaging of boys. Not even talking about white males because they’ve been targetted long enough that they probably don’t even watch TV/Hollywood anymore, apart from progressist white males who cheer at people who say whiteness ought to be banned.

The reason people rush on small creators is they’re politically incorrect, meaning they’re non-PSA shows. People are so upset of being told that they’re sexist if they don’t date a transsexual, that they’re able to trade the quality of image/montage/content of traditional TV shows for a content that doesn’t constantly give lessons or disparage them.

What you call fragmentation will be instantly reunified if a platform ever succeeds to get rid of the pressure to put PSA-compatible characters under the customers’ eye. They’re tired of being the product.