Professors who treat their grad students like slave labor almost always create their own comeuppance. See, one day, that grad student will be a PhD. And becaus

Professors who treat their grad students like slave labor almost always create their own comeuppance. See, one day, that grad student will be a PhD. And because you abused him like slave labor, instead of being a peer you can collaborate with, he becomes your competitor. You find yourself getting less funding and less people willing to go in on grants with you because some young, hotshot upstart took own of his PhD level ideas you don't own and turned it into something valuable. And you're scrambling to catch up.