From what I know a pandemic such as this one cannot be monetize by pharmaceutical businesses if they find an antidote. That would violate a lot of international laws which a lot of countries already agreed and the company's CEO might be charged such as crimes against humanity. If they found a cure the best thing the company will get is either a subsidy for their research as well as some compensation for their efforts, they might profit a little but they won't be billionaires because of it as they cannot make this antidote/cure exclusive to the rich, this cure will be everyone's right to receive.
Even if they won't lie about researches of antidote be sure they will be highly rewarded for all masks, drugs, supplies etc. they are selling right now.
You are right in saying that supplying medicines to stop the virus are going to be rewarded but I don't think that any medicine has been made to stop this virus till now. many of us give false news about doing business The system of this country is weak and there's no action against those that violate the bounds.