Merck can't benefit from both ivermectin & their new emergency-use-authorized drug. Emergency use authorization requires "no adequate, approved, and available alternatives." [1]

It's against their financial incentive to have ivermectin, an out-of-patent drug, be authorized for treatment of covid. See https://twitter.com/BretWeinstein/status/1402647948371005441...

[1] https://www.fda.gov/vaccines-blood-biologics/vaccines/emerge...