I'll surmise that reputable horseracing and dog racing outfits, though in it for profit, treated their animals humanely. Got to know that for others, not so much.
We know about puppy mills and what happens there. Animals bred only to breed and sell until they cannot breed anymore; inhumane conditions. Held in slings and cages with their feet never touching the ground.
But humans support those practices.
I was half listening to a program on Animal Planet yesterday, maybe Dodo Heroes or other program that featured rescues, among other things. A contingent of natives somewhere in the world earnestly believe that torturing the animal before killing them makes their meat (food) taste better. This is their belief, like a religion, not just a pure evil intent.
Humans figure out how to profit. Whether it is good for all concerned is another matter. Whether a particular practice should be outlawed, or regulated, is another matter.
Candy