Hydroxychloroquine does not work on influenza virus, but Tamiflu does, very well, in fact.
Logical, and even illogical but ethical people have a hard time grasping what is going on. Hydroxychloroquine has proven efficacy, safety, is cheap, plentiful... In fact the only thing going against it is that it is old and cannot be patented.
Instead of trying to logically cipher it out, pretend that your only motive was extraction of dollars from the crisis at hand. Most dollars? Vaccines. Federally financed and mandated. Vaccines have never worked on coronavirus, which is usually just the sniffles. The immune system handles it well enough, though coronavirus has the sneaky strategy of mutating frequently, so it may infect one family member, then another, and so forth. By the time the first has become immune, the last to be infected may reinfect the first, because the virus's immune signature has mutated and is no longer recognized by the first member's immune system. So vaccines will not be effective, yet they will still be heavily marketed because they are so lucrative.
Hydroxychloroquine prophylaxis costs me $20/mo,cash price. Not lucrative for anyone, really. In fact, like most health strategies, it deprives the industry of health related revenues.

The HCQ-AZ combination, when started immediately after diagnosis, appears to be a safe and efficient treatment for COVID-19, with a mortality rate of 0.5%, in elderly patients. It avoids worsening and clears virus persistence and contagious infectivity in most cases.