One of them is the increased number of people caring for mental status, but the other one is, we are living in an era that requires long hours of computer usage which is against the living way of an ADHD person. We need to walk, go out, spend energy, but nowadays we have to stay in an office, look at a screen, which is so boring.
It’s only relatively recently been understood, defined, and studied. As in the last 50ish years, but with a much-heavier emphasis on more recently, now on the order of ~2,500ish peer-reviewed papers per year.