I would be astounded if there are many billionaires in the USA who are not this moment already taking chloroquine/hydroxychloroquine in the recommended prophylaxis doses, even outside of those deemed mission-critical by the most powerful organization on the continent.
There's a phase 3 trial for treating pneumonia associated with coronavirus. This is based on prior work showing anti-inflammatory response in rheumatoid arthritis (https://www.ncbi.nlm.nih.gov/pubmed/8278823).
Note that the trial is happening in China (https://clinicaltrials.gov/ct2/show/NCT04261517), where the barriers of entry and approval are quite low.