People were blocked from getting ivermectin prescriptions. Doctors were told not to write them. Pharmacies were told not to fill them. There was no conspiracy. It was done completely openly. It was just decided by "the scientists" and effectively banned from the mainline medical system. Any doctor working in a network healthcare system (most of them) was basically told they could not prescribe it.

Given it's long history and safety, why was this necessary? Much is learned in medicine by practitioners trying things and sharing their results amongst each other.