Unless the stories are obviously AI generated too I'd assume it's bots/grifters scraping posts from r/HFY and running them through a text-to-speech thing, genning some images to accompany it, stitching it together into a slideshow video, and posting it in the hopes of grifting ad money. If they are clearly also AI generated stories then the same thing, except it was openAI or whoever that scraped the sub and can churn that slop out for them.
As a genre, HFY itself started off of stuff that was imitating things like The Road Not Taken and just general internet contrarianism/edginess built off the real literary/worldbuilding complaint that sci-fi and fantasy stories usually made humans into some kind of generic middleground species or ascribed something sort of naive and bland like "adaptability" or "imagination" as traits that humans had above other sapient beings, and more or less coming to conclusions like "humans are (space) orcs, actually" and more or less wanking to things in the vein of WWII Medal of Honor recipient stories, endurance hunting, or extreme survival stories. Naturally that had an intrinsically fashy sort of vibe, since it was all about stirring up this mix of painful and triumphant vicarious emotions, of violent destruction and overcoming, all in a completely empty and purposeless way, just giving someone an empty tearjerking power kick.
Now looking at r/HFY it seems like it turned into people posting chapter by chapter power fantasy webnovels indistinguishable from like the sloppiest isekai or "super powered guy shunned by party but he'll show them!" sort of slop, except it's being published in English first instead of in Japanese. In fact I think some of it is literally just an English version of those exact sorts of genres, I even saw villainess genre slop on the first and only page I glanced at just now.
So yeah that explains the why, who, and who I think: it's empty formulaic power fantasy slop with a fashy western flavor targeting the same sort of people that isekai and related power fantasy slop is.



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