It wasn't simply hydroxychloroquine. The establishment suppressed discussion of all therapies and preventative measures.
BTW: hydroxychloroquine alone is not a sufficient therapy. However, it appears to work well as part of therapies that include zinc, magnesium and Vitamin D.
They knew that sunshine helped with the Spanish Flu. The COVID19 pandemic had people locked inside where they didn't get sunshine. The establishment was clearly favoring control mechanisms over science.
Yes, a multifaceted approach is recommended. And you are right, of course, basically anything that is not their profit-driven "solution" needs to be erased from consideration ... even the sun.