I have no doubt that this may be the reason that you personally have abandoned mainstream media in favor of more niche sources, but to attribute that motivation to an entire generation is a huge amount of projection. It has everything to do with convenience and shifting habits, not a rebellion against political correctness.
Not everything is about right vs left culture wars.
> The reason people rush on small creators is they’re politically incorrect, meaning they’re non-PSA shows.
When I think of small creators [1] that I personally enjoy (e.g. Vsauce's Michael Stevens, Veritasium's Derek Muller, Game/Film Theory's Matthew Patrick, Because Science's Kyle Hill), those are all Youtube success stories, and none of them fit this description even a little bit. Grandparent is just mistaking his particular bubble for the average.
[1] Those all have subscribers in the millions, but I still consider them small media startups compared to the scale of traditional media conglomerates.
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.