I think getting dissociative identity disorder (or good old fashioned split/multiple personality disorder) confused with someone having more than one log in are different things.
There have been threads about loneliness and depression/low mood which does seem to attract a more sympathetic tone but mental health in the context of personality disorders of indeed dissociative identity disorders (as a result of trauma, combat stress etc) are still fair game for banter. So long as folk are discussing it right!
I don’t believe for one minute someone with multiple accounts is struggling with their mental health I’m simply interested in their motivations.