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So even if you assume for the sake of argument that Astra Zeneca & friends are 100% corrupt and profit-driven, there's literally hundreds of health, science and policy professionals between you and them, and there's media. No real conspiracy would survive this for long.
In case of ivermectin you got exactly the opposite - 100% direct sales channel between some fishy traders and uneducated buyers, driven by a few health professionals going right against the scientific consensus.