We need to be clear on one point: what drives Trump is not what drives good doctors. Unlike Trump, I expect doctors involved in treating CV19 patients to make their own decisions based on the evidence, not on what an obvious idiot like Trump says. Because of the crisis, research results are being released prior to publication before going through peer review. That does create hazards especially when bloviates like Trump get involved--or amateur doctors like journalists.
Medical interest in hydroxychloroquine predates the French studies--not mentioned in the Guardian piece. China was using it on their COVID patients to some extent in January. South Korea was using it after that. The first MedCram video mentioning chloroquine was back on Feb. 5 well before the release of the first French study in prepublication form. The guy making the MedCram videos, Dr. Roger Seuhultm is a pulmonologist, intensivist who at the time knew he would be treating COVID patients. In his videos (there are multiple videos where he discusses the drug) he identifies two mechanisms by which the drug might help. It might interfere with virus replication itself or it might act as an ionophore allowing zinc ions to enter cells where the zinc could interfere with viral replication. He expressly stated in the first video that trials were needed to see if the stuff actually works pointing out that anecdotal evidence could just be coincidence.
Emphasis: Seuhult was talking about the drug in a youtube video on Feb. 5, and Seuhult is only one doctor among many who were aware of the drug's potential application.
Meanwhile, there are the great unwashed masses of doctors who have no expertise related to treating COVID patients who woke up one day, heard news of Trump's bloviations, checked it out with a quick literature search (I guess) and started hoarding it. My father taught biochemistry to a lot of future doctors back when, and in general did not have that [high] of an high opinion of them. He said you do not have to [be] intelligent, just have a good memory. Driving down the road with him, he would sometimes point to some doctor's office with a name on it and say, "Don't go to him if you can possibly help it." Apparently, a lot of them are selfish, too, not just incompetent.
To put the Guardian piece in perspecive, interest in hydroxychloroquine was pretty high prior to the French studies. (The Guardian does not mention the second one.) Along came Trump spewing shit everywhere. People get all excited about Trump (soap opera) and ignore the underlying interest in the drug among the doctors who would prescribe it (irrespective of what Trump says). Everyday people start saying wildly misleading things about the drug, such as being handed out like candy.
Meanwhile, the FDA is taking hydroxychloroquine seriously and is testing it presumably in double-blind studies , and Dr. Roger Seuhult got his first COVID ICU patients only last week.