Assuming even a tiny amount of those are loud when exploring their discovery would mean a lot of people talking about it online.
This is likely also combined with Millennials (my cohort at least) being one of the most self-aware generational cohorts in history (while also being a tad self-centered).
I have my own journey with ADHD ("many markers" but no official diagnosis, as that could negatively affect my life in Sweden) and it was really liberating to learn that, no, I wasn't just lazy, that I may have an issue with executive function and if I work around it I can at least partially tackle it.
The amount of stress that gets applied by society for people who are "not performing up to their potential" or slacking off or what-have-you is actually quite immense when you cannot force yourself to work, so I understand people who feel liberated in the moment and who seek solutions, loudly.