You don't want to trust experts for mental/general health, and you encourage people find others who "got results". In essence, you have just made random people the experts, but worse, allowed them to run freely without any risk of reputation harm. I can sue a doctor for malpractice, I can't sue user21389 for false results. Why do you so quickly believe these experiences of randoms?
This idea modern healthcare exists to make a profit doesn't apply in all cases, and you imply they use these profits to create a false narrative of experts. But yet ignore that exact same thing is happening with the supplement industry (not regulated btw), of people claiming their ADHD was cured by taking a couple of supplements - "it's better than being drugged by Big Pharma" they say. This individualistic mindset only encourages these predatory companies to swoop in and say hey, I know exactly the right cure smoke this, crush these herbs, drink that.
Made even worse by the fact people aren't honest about how their meds have helped them get to a stage where they have replaced old routines with better ones, started therapy, etc. Yet they look back, post on social media "antidepressants are the worst - quit now!"
Forgive me if this is harsh, I've seen way too many people spend way too much money and time on BS when they could have got serious help.
Don't get me wrong, finding a diet that works for you, being more active, being more social, these are all great things nobody disagrees on. But this idea I'm supposed to trust a random person online, cured of his ADD, because he started eating less bread is one I am going to treat with the same severe skepticism you hold regarding mental health experts. :)