The specific circumstances where the drugs are effective aren't being met. I didn't look up the details before.

https://academic.oup.com/aje/article/doi/10.1093/aje/kwaa093....

> Evidence about use of hydroxychloroquine alone, or of hydroxychloroquine+azithromycin in inpatients, is irrelevant concerning efficacy of the pair in early high-risk outpatient disease. Five studies, including two controlled clinical trials, have demonstrated significant major outpatient treatment efficacy.