ok so I have personal experience of this.
i have a long history of mental illness, thankfully now very well managed, but that wasn’t always the case.
During one episode of psychosis about 20yrs ago, I became convinced that I want real, that I had no bones, no skeleton, that I was just stuck inside a sort of person suit looking out through the eyeholes. Now, this was actually severe dissociation which tipped into psychosis, but of course being in it I was not aware of this - I fully believed I was correct and that the people around me didn’t believe me was very distressing to me.
It got to the point I was very very close to attempting to cut off my own arm, with an axe, to prove to everyone that there was nothing inside. To me, it was a completely logical thing to do and once I’d thought of it I was full of relief that finally I could prove that I was right.
Thankfully (and I am SO thankful) I was sectioned, medicated, and in time regained connection with my body and was no longer in a psychotic or dissociative state.
I am horrified to think that if that had happened today, and I had ventured online, I would have been encouraged to do it.
I didn’t need to cut off my arm - I needed urgent psychiatric care - and I am very glad I live in the UK and was able to receive it.