The only test better than a double blind experiment is what might be called an on/off experiment. You observe data and then turn off one input, wait, and then turn it back on. That allows you to measure the effect of the input you removed. In this case the effect is pretty clear. When you stop treatment with HCQ nationwide more people die from COVID 19 instead of recovering.
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One of the things about double blind experiments that is very annoying to the experimenters is the God effect of ANY treatment. Just the faith and power of positive thinking cures people. Many times the sugar pill has a greater cure rate than the real drug they are testing. So whether the very inexpensive HCL-zinc-zpac works or not, in the words of President Trump: "What have you got to lose?" At a minimum these doctors are giving hope and optimism during a time of madness. And there is more hard scientific evidence HCL works than there is for face masks and 6 foot distancing.
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I read of something similar happening in Peru which has had a very high death rate. For a little while an ionophore was being used, but then a government change caused it to be forbidden again. It may have been Ivermectin rather than HCQ. I wish I could find it again or have someone else locate it.