Ivermectin works because the first trials were done in developing economies where the average person had a high chance of parasitic infections. The steroids used as a standard front-line treatment for severe COVID decreases the immune response to parasites, allowing them to multiply unchecked. This killed patients indirectly, but dead is dead, and they "checked in" with COVID, not parasite complaints.

Ivermectin is a wildly effective anti-parasitic, so unsurprisingly it reduces mortality rates in countries where the endemic parasite infection rate is something like 50 percent.

This study appears to have been done in Canada, where parasite infection rates in the general population are probably 1% or less. Hence... no demonstrable benefit to using Ivermectin!

Nonetheless, Ivermectin is safe drug to take in normal doses, and will help people that are hospitalised with COVID and are given steroids.

It's not a prophylactic and high doses are not a treatment for COVID itself.

The misunderstandings around this drug stem from misunderstandings of basic statistics and the scientific method. This is why you shouldn't get your medical advice from Joe Rogan.