>the scientists and medical professionals claiming that ivermectin was effective for treating COVID were doing it in spite of the professional stigmatisation

Many of those people went from earning six figures a year as medical professionals to earning six figures a month as "influencers". Patreon has radically altered the marketplace of ideas, for better and for worse; for those who are unscrupulous or merely deluded, there are now some very attractive alternatives to mainstream legitimacy.