Generational impacts
So, I'll be brief. I'm a parent of an adult child who is autistic and has schizophrenia but who is also deep into the systems subculture. They don't have DID, and I think their having treatment resistant schizophrenia has a lot to do with their identity stuff.
So all that aside, there are four other DID or system claimers I've run into in person, and all of them have other mental health conditions or are neurodiverse with some co morbidities. BPD and psychosis-related stuff.
Other correlation (obviously not causation, but I suspect it is incorporated into the systems subculture) are anime type hyper fixations and art, furry fandom, and what I suspect is the rise of sick-lit young adult books.
So sick lit. Do you think that it's rise amongst Gen Z readers in the 2010s played a part in this? There was some romanticization of terminal illnesses for us in Gen X (think the movies Wild at Heart and Dying Young), but most of our young adult books were choose your own adventure type things and not focused on rare diseases.
The irony about all of this is we have a dominant genetic rare disease in the family, so honestly, why fake that shit when you have a 50% chance of being doomed by your mendelian inheritance??