Stumbled on someone decrying TikTok "multiplicity kids" on twitter, but not sure how I feel about this thing and there's no wikipedia article which is usually the limit of my research.
On one hand DID and OSDD are real things, though some people say it's a culture specific disorder.
On the other kids having calling themselves "we", claiming to be piloted by Harry Potter characters, real-life serial killer and Minecraft YouTubers seems to silly to not be just good clean fun.
On the third hand is you told someone thirty years ago about gender spectrum, genderfluidity, xenogenders, bi lesbians, autism spectrum, they'll probably think you're insane. Maybe there is a subclinical version of DID, like Asperger's to autism, so to speak? I dunno...
Anyway if it's mostly The Kids These Days that are doing this there's a decent chance that 80% of them are participating in an activity that's charitably called mutual social expression and uncharitably called clout-chasing/attention grabbing. They'll eventually hit the age where small, non-internet peer approval becomes much more important to them and they'll grow out of it, or they won't and end up either here or on 4chan.
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don't kid yourself we don't attract as much attention, nor produce as much content, as 4chan. They can go to reddit or tumblr or any other social media and get that same fix way more efficiently than here.