I dont know.
Here is the FDA EUA page:
https://www.fda.gov/emergency-preparedness-and-response/mcm-legal-regulatory-and-policy-framework/emergency-use-authorization
Perhaps it is because Remdesivir is limited in scope (hospitalized patients) and also a EUA.
Pretty sure Remdesivir isn’t under EUA approval.
In any case, no off-label drug use should be off the table if one’s doctor thinks it is effective. Sadly, this isn’t the case for far too many doctors it seems.
That said, I view relying on any potential treatment as a poor substitute for vaccination.