Animals eat food, too. If you eat meat, you’re actually creating more demand for crops than you would if you ate the crops directly. Furthermore, migrant workers also work on animal farms, in slaughterhouses, etc. I hear it’s not always great.
I guess what I’m saying is, I’m fairly sure that going vegan helps both animals and the children of migrant workers.
One caveat is that I’m assuming you’d eat the same classes of crops that an animal would, namely things like corn and grains. But honestly that sounds about right for most people, vegans included. Many vegans eat a lot of processed shit too lol. (me included)
Edit: I should add that the most commonly suggested vegan diet that I’ve heard from other vegans is to have rice and lentils as your staple foods. I’m fairly sure those aren’t typically harvested by hand, but I could be wrong.
Humans in developed countries are in a position where we can reduce our harm to others. I believe that if you’re in a position to be safely and reasonably able to, that you should do your best to reduce the harm you cause. I would argue that reducing harm includes reducing the amount of animals that I eat.
However, none of this really applies to animals. They don’t really get the same privileges that humans do in modern society, nor do they have the conscious ability to consider their harm on the world. Furthermore, obligate carnivores don’t really have a choice but to eat meat, so they wouldn’t be able to safely reduce the harm they cause regardless.