It depends on the country you live. In some countries it's used (almost) only for animals, because the health conditions of humans is so good that you don't need dewormers. In other countries there are national plans to give most of the population dewormers because it's an endemic problem.

Many of the papers claiming that ivermectin was good against covid-19 were produced by hospitals running these national programs. You are already giving ivermectin to a lot of people, so you it's almost free to count the deads in the people getting ivermectin and compare it to the death of the general population. (In my opinion they use bad statistics to get the results, there are a lot of bias that they can't fix. Double blind randomized controlled trial or it didn't happen.)