There's a shortfall of evidence around the topic of human trafficking, which my colleague explores in this report on human trafficking. Innovations for Poverty Action explores this in some new reports here, and here.
My sense from a cursory overview of the problem and tentative solutions: human trafficking is an important cause (comparable in scale (DALYs) to a problem like maternal disorders, but the solvability is of much lower confidence than for problems of similar or greater significance, such as malaria deaths.
For instance, evaluators have strong confidence -- based on lots of robust academic peer-reviewed and RCT evidence -- that we can prevent a death by malaria for $3-5k.
We don't have comparably strong evidence for preventing human trafficking (and if there is, I'd love to see it!)
Two ways it goes well for animals:
1. As incomes rise globally, initially it's worse for animals because demand for meat rises. But once incomes rise from high to very high, desire for high-welfare standard meat increases and factory farming is eventually outlawed (not everywhere, but almost).
2. Economic development spurred on by AGI leads to further displacement of wild habitats, reducing wild animal suffering.