Two reasons for the refusal to use HCl-Z.
One is that Trump recommended it rendering the lifesaving drug politically poisonous.
Two is that it is effective and could stop the whole Political/economic WuhanPanic operation before it reaches maximum effectiveness in October.
Three. It is a low cost treatment
Now many are complaining about the cost of remdesivir
https://www.usatoday.com/story/money/2020/06/30/coronavirus-drug-remdesivir-gets-price-tag/3284050001/
$390-$520vial or $2340/$3120 per treatment
Vs HCQ $10 for 5-7 day course (zinc adds $20)