This sounds exactly like every quack scam out there. The mean old medical authorities are ignoring me! They must be jealous. Yeah, that's it.
https://www.techdirt.com/articles/20140925/08202528637/crowd...
https://en.wikipedia.org/wiki/Dichloroacetic_acid
So if this guy doesn't want to play ball with a pharmaceutical company, it's entirely likely that his research could go under-reported or under-utilized for many years.
Now of course, these facts don't MAKE his story true. Just that your offhand dismissal of the possibility of it being true isn't quite so rock solid.
You're just being negative here by willfully ignoring that said doctor is giving the drug away for free, which is not the usual modus operandi of quack doctors.