Some may fake it, but more worriedly, I feel that social media algorithms lead people down a path to believing they have something and in good faith, they may find ways to push for a diagnosis, not that they don't have symptoms or difficulties, but because it's easier, as noted by journalist above, to fake an ADHD diagnosis than to fake diabetes. So, if one believes they have ADHD, it's can be a self-fulfilling cascade of medical intervention to try to prove it. With the US, money behind the marketing of prescription medication mixed w/ unethical doctors is a bad cocktail.
I don't have an answer as to all the reasons why, except social contagion has cause young girls to display symptoms of Tourette's syndrome*, for example.
There is a rise in black market ADHD medication in young people around exam time (2/3rds got it illegally from peers)*
Pringsheim, Tamara, and Martino, Davide (2021). "Rapid onset of functional tic-like behaviours in young adults during the COVID-19 pandemic." European Journal of Neurology 2021;00:1–4. https://doi. org/10.1111/ene.15034.
'
“12 girls at NY high school develop involuntary tics; doc says it’s ‘mass psychogenic illness.’” The Washington Post, 20 Jan 2012.
https://psych.wisc.edu/news/easy-access-pressure-on-students-contributes-to-increase-in-non-prescribed-adderall-use/
Okay, so I just found that the Daily Mail has a US version, and you're right, it's fun (love me some Jason Momoa)
www.dailymail.co.uk/news/article-14962643/Jason-Momoa-Chief-War-sharks-Hawaiians.html