So like, on the topic of how to address the rise in glamorizing mental issues, and potentially leaving vulnerable people to think that they have them--this has happened many times in history. But whenever we see this happen, the solution is to stop reporting on the thing and get it out of the public eye, and get licensed therapists in there to study what is happening and find the best care. Basically stop making it trend, and it will fade. Like there are many places that do not report on mass shootings and suicides on the front page of the news and it's because of the risk of copycat behavior, it's pretty real.
I don't know if Tik Tok does that regulation very well, and it may be worth just reporting those accounts that are glamorizing mental illness or that you suspect are feigning it. It would probably be against the TOS to do that sort of thing, because it's against TOS everywhere else. I don't think it would be good to confront it, however, because you don't know really know what they're going through offline. I think a lot of kids role play on tik tok too, so they may not even realize what they're doing is wrong if they know that they are faking it.
And, on the subject of DID--I don't think kids know the history of the disorder. So like MPD comes and goes every so often, and is treated a little differently depending on what Psychology believes at the time. When Satanic Panic hit in the 80's/90's, Multiple Personality Disorder was used as a mechanism to "revive old memories" to prove that Satanic cults were abducting children. Patients went so far to describe these cults they could describe what they looked like. So far, that the FBI even looked into it (and proved this never happened.) It's a fascinating read cuz like I'm too young to remember this, but I'm old enough that I had teachers who warned me about this https://www.garygreenbergonline.com/w/wp-content/uploads/2013/12/Psychiatric_Times_-_When_Psychiatry_Battled_the_Devil_-_2013-12-06.pdf
So the solution was to change the name of MPD to DID, and change the therapy so you had to be a more qualified therapist to diagnose and treat the disorder. They also decided that the disorder wasn't actually proven to reveal real memories. They couldn't even prove that it technically does or doesn't exist, so they just renamed it and that did enough of the job. The disorder virtually disappeared very quickly after that, although it was so heated during the late 80's. Some patients who were incorrectly diagnosed, had to sue their therapists for the incorrect diagnosis and treatment, especially when insurance companies stopped supporting MPD treatments. It was truly a time in history.
But what's really wild about the human brain is that there were people that legitimately thought they had been abducted by cults. They were sincere. (well maybe not 100% of them, but many were) Like how people danced until they died in medieval France, the brain is really freakin weird, we don't fully understand it, and hysteria can just happen through exposure. As to what the tipping point is, no one knows. But Tik Tok will have to regulate their content in the same way tumblr and other social medias had to regulate their content. Just report it and the accounts will probably either be banned or taken down.