Kind of like how constant sugar can spike insulin and with weight gain over time can creates insulin resistance/diabetes. It's like type 1 vs type 2. So in this analogy Type 1 people with ADHD would be people who are born with it and it's lifelong, and type 2 ADHD people acquire it after indulging in these dopamine producing addicting web products for years and your reward system/executive function is messed up, impacting daily life similar to people who are born with ADHD.
My hypothesis: ADHD is defined as X out of Y listed symptoms, almost all of which people experience in some way at some points in their lives. The difference is between "I sometimes have problems with some of these things" vs. "I have significant problems with many of these to the point where it is a big and constant problem in my daily life and causes me great pain".
So people who sometimes have trouble focusing see that it's on the ADHD list and take up this soft position of "Maybe I have ADHD" or jokingly talk about probably having a little ADHD or something like that.
It's the same with OCD. How many people have you seen on Reddit confess to having OCD or OCD-lite or "probably OCD" etc.? A lot more than the official diagnosis statistics right.
I don't think it's because Reddit creates OCD symptoms though.
And everything is a spectrum, everything - nobody is immune to indecision fog, getting sidetracked, feeling helpless in front of a decision that feels bigger than it rationally is, etc... but those moments usually happen rarely, for some people it is a constant fight that actively lowers their quality of life.