I suspect a lot of crossover between r9k/blackpill/NEET types and trans culture. A lot of NEETs or similar losers have a misguided nostalgia for being a kid and teenager. It's not that high school was fun, it's just that they were allowed to not have a job, play vidya and watch anime without the pressures of paying bills. It's all about their failure to be a functioning adult.
By their mid-20s, they are filled with self-loathing, regret, and years of porn. Reinventing themselves as a girl sounds logical to them. They now have a goal (though the goalposts keep moving). They find a supportive community. They are politically topical and receive lots of attention they would never get as cis males. Hell, some of them even rave about how glad they are that now they can cry on others' shoulders and get support for their depression because girls are "allowed" to do that.
There's probably a huge psychological analysis that can be done on the connection of troonery and peter pan syndrome. The hatred of natural puberty, the mourning for what they perceive as a wasted youth, a longing to be small and cute, the infantilizing online culture. it's always stuck out to me.