A decent rebuttal from an industry veteran - https://www.science.org/content/blog-post/anarchist-drugs-all-yeahboy
Really, the major idea I see here is not the amateurish synthesis of existing drugs (which is probably very dangerous anyway) but access to medicines on the patient's terms.
Why isn't everyone in every country able to get access to a specific drug? Why one country allows it, another doesn't approve it - at the same time? Why do we have to go through some gatekeepers because the 'State' is paying for it? This is especially true as most of the world has public healthcare systems. The point is that drugs aren't always available on the patient's terms - especially if they depend on Big Brother subsidizing it. There is too much power given to the medical profession and the Government. Cost is the other issue, in the case where it isn't subsidized, you are able to get a doc to give you a prescription, no strings attached - it could be very expensive to buy. Improve cost and access and none of this is necessary.
Another aspect is new cell therapy type drugs. This is going to be much more complex to deliver, and expensive. However, if this guy can show that things can be done cheaper in a decentralized way, people might start to question why It's so expensive.