Well it's also because the pharmaceutical industry is largely monopolistic and rent seeking through the use of patent monopolies, so when there's a generic drug like ivermectin that can actually be used to treat covid, pharmaceutical companies and the MSM networks they sponsor will go to the end of the earth to slander and destroy it's reputation because they can't make as much money off of it.
I think this ties into the bigger picture of how much IP laws have corrupted our society and our idea of a free market, these laws don't encourage innovation like one would have you believe, instead they discourage innovation and encourage monopolies and unproductive rent seeking. Ever wonder why game and movie companies release the same product every single years? Same thing.