I know there's really no way I can say this without sounding like a jerk so I'm just going to embrace the fact that I'm a bit of a jerk here. I had two entire friend groups collapse because kin drama. I got sexually harrassed by 21 year old adult man who thought he was literally 50 anime characters at once. I got to see young people struggling with identity dig themselves into holes of borderline anti-recovery behavior.
I've also had to explain to non-internet culture people that kin isn't the same thing as trans. I had someone legitimately think that kin was the "evolution of being trans" and I dont need to elaborate on how damaging it is to think that a 21 year old man who believes himself to be 50 anime characters in real life is the same as someone who's transitioning.