Unfortunately I think getting everyone else to run around after you is part of the motivation for some people.
A teenager of my acquaintance, immature and a chronic attention-seeker (probably autistic; batshit mother) has not only changed gender but required everyone to follow obediently along through two changes of name.
Being able to garner loads of sympathy and control the adults is a win-win, and probably induces feelings of power. The person in question, given what I know of them, is highly unlikely to have the willingness or capacity to understand what the future might hold. There's no sense of responsibility there, either. I feel sorry for the kid, tbh: society should never have let this level of crazy take off and become normalised.