I think there is a broad cultural problem with the current state of fanfiction that likely stems from the proliferation of fics-turned-published-novels wherein fic authors now feel they have a duty to churn out a high volume of content at an inhuman rate. and in order to meet those demands, they resort to AI. and that sucks.
I think readers and consumers of fanfiction broadly speaking also have a bad habit of feeding into this culture by demanding and expecting a high volume of content churned out at an inhuman rate, and it often prevents them from accurately assessing the quality of what they're reading, leading to a general degeneration of fic quality, feeding an audience that is getting worse at recognizing good art vs. bad art. and that sucks.
going from 1,800 fics to over 38,000 fics for a single ship in less than six months is not normal and should have been a warning sign for people that there was likely a fuckton of slop being produced and posted. and that sucks.
I don't like the excuse that some authors are using that they only used AI to beta their work. there are plenty of humans who would happily beta your fic for you. and if your reasoning for not using a human is because you wanted your work beta'd faster, I would implore you to examine WHY you feel like you are on some kind of binding schedule in a hobby space. kill the profit-driven manager in your brain and take your time making shit.
generally speaking, I believe this is a problem that is driven by both readers and writers but at the end of the day, the real driver - as ever - is capital, and its influence on art and creativity. I don't blame authors or readers for falling victim to this because the world around us sucks, but my god we all need to at least try a little harder to resist.
if you're a reader, be critical of what you're seeing and consuming. and if you're a writer, stop giving away any piece of the creative process to AI. silence the part of you that insists you must post as much as possible all the time. you do not have to capitulate to hustle culture and also your fanfiction will probably not actually make you rich and famous, even if all those comments and kudos are making you feel important.
ultimately we have got to get back to writing and reading fanfic for the love of the game. also I don't think the callout posts about authors using AI are helpful either btw like I think the best choice if you're reading a fic that you suspect might be AI is to simply not read or engage with it. and then go read and engage with something made by a human.