I wondered if perhaps my friend had been led to gender dysphoria by porn addiction. He would literally come home every day and lock himself in his room to browse and jerk off to porn for hours. Every day. And his fetishes got more depraved over time just like mine did because sex addiction depends on new stimuli and novelty to keep away tolerance. When I told my friend about my experience recovering from porn addiction and how much it was twisting my mind in a powerful way. he/she got extremely defensive and angry with me, like suggesting to a heroin addict that maybe they'd be better without heroin (and I didn't even tell them to stop or suggest that, I just shared my experience and how much better I felt after being porn-free).
I met another trans person a few years ago and got to know them. Male-to-female. Surprise surprise, raging porn addict sine 11 years old. This isn't too shocking, around 47% of 14 year olds today are porn consumers and its very rare to find someone who does not consume porn, and if they don't watch porn they are ostracized as prude.
I strongly think there is a large probability that the way porn poisons your mind is making way more people question their gender.
Some resources regarding masturbation, porn, and the brain:
Frequent masturbation lowers testosterone utilization https://www.researchgate.net/profile/Alonso_Fernandez-Guasti/publication/6536830_Relationship_between_Sexual_Satiety_and_Brain_Androgen_Receptors/links/54b6c2970cf2e68eb27f0321/Relationship-between-Sexual-Satiety-and-Brain-Androgen-Receptors.pdf
Three weeks of abstinence increases testostorone levels https://www.ncbi.nlm.nih.gov/pubmed/11760788
Masturbation is associated with lower psychological health and reproductive well-being https://www.tandfonline.com/doi/abs/10.1080/14681994.2019.1677883