Our regulations don’t allow anyone to make a claim without the clinical studies to prove the claim.
If they do they can be fined, have their product removed from market and destroyed, be banned from the industry personally and by company, fined, and even jailed.
On the other hand doctors prescribe for off label purposes all the time. It is safe and effective for the most similar virus (SARS-CoV1) in the world for this one (SARS-CoV2), if the system is so sclerotic it can’t allow this, there is something wrong. President Trump has dictated that it should be allowed, so let it be written, so let it be done.