The people who fall for this stuff also had too much time, and you can guess how well their relationship with mom and dad was. It wasn't pretty, it was always screaming and yammering matches between the kid and parent.
So the kid/NEET went to the one place he could escape this all, the internet. And guess who was there on the internet waiting for him, groomers and YouTubers saying that "HRT fixes you bro".