I think all avenues of approach should be explored, not just for the suppression of SARS CoV-2, but to find simple and inexpensive means to combat viral infections in general. By identifying and removing as many risk factors as possible which can be removed through nutrition or supplementation, the impact of any disease could be lessened in the future.
However, there is no major profit in existing medications adapted to use for COVID-19 (or as antivirals otherwise), and even less in using simple supplements sold OTC to reduce risk or the severity of the disease.
As with other common viral infections in the US and abroad, remedies aimed at reducing the severity of symptoms have been the focus, not the disease itself (except when vaccines are involved for specific diseases).
The evidence is plain to see, in that the less expensive the treatment ("cure"), the more it has been attacked as ineffective, as if expense (or patentability) alone is the determining factor in efficacy.
Hydroxychloriquine, a macrolide antibiotic (Azithromycin or Erythromycin) and zinc, for one, Ivermectin with a macrolide antibiotic and zinc, were two such regimens which were studied without the critical zinc, only the ionophore and (sometimes) the macrolide to produce "evidence" that the regimens were ineffective.
To say the least, this was bad science.
Not only was scientific inquiry soiled by the rush to prove the regimens ineffective (instead of to test the full regimen), even though the full regimen was commonly NOT used, or used when least effective (since it is a proactive preventative, stopping viral reproduction, and not a regimen intended to reverse damage done nor deal with the late stage disease, but credibility of the medical community severely damaged (imho) when even social media platforms were used to suppress information about treatments that did not require extensive hospital involvement or a vaccine (which could be patented)--both of which held great promise for a return on investment, unlike drugs that have been on the market for up to 70 years and are available over the counter in many countries.
Unfortunately, political factors seem to be a key factor as well, and the maintenance of fear in the masses, and the requirement of questionable preventative measures against a BSL-4 pathogen persist.