Someone said the exact same thing to me when HCQ was pushed with bad quality studies by certain doctors to Fox News hosts who then pushed it to Trump. Higher quality studies later found it wasn't useful. So there.
You seem to be confused. The studies which "later found it wasn't useful" were fabricated, as was discovered mere days after they hit the news. They weren't even plausible.
The initial studies were bad quality, they just removed the people who got admitted to ICUs from the treatment group. They were run by a doctor known to be a charlatan. They were pushed to Trump as a magic way to calm the people and market down.
I don't get why people like you think the world is so US centric. The world doesn't give a flying fuck about giving Trump a very slight lower chance of getting re-elected, much less kill their people and their economy for it. I don't see how studies across the world were fabricated, there's no reason for, say, India to kill millions of their citizens and destroy their economy by faking studies about HCQ when they don't hate Trump and may have even liked him.
You're the one that's confused, here's an analysis on HCQ from someone that has worked on drug discovery for decades.
And I don't think Trump pushed Ivermectin? If it works so well as you think, one would think the Democrats would be all over it so they can say Biden cured Covid and restored the economy.