Money.
I don’t think it’s that simple. Science certainly requires funding, as the development of new drugs also does. Some people may be susceptible to being ‘bribed’ or silenced in certain ways, but not all scientists and doctors are.
Are there ANY scientific studies being done with hydroxychloroquine/zinc? I’ve only read about one study regarding its use in Veterans’ facilities, which claims to have proven that it was of no real use, or dangerous.
But that seems like an extremely fast, early study, in a population that would be prone to lots of pre-existing conditions which would cause the disease to hit harder anyway; and the scarcity of testing ability that we experienced early in the game probably would have precluded knowing what the patients were actually suffering until somewhat late (?)