> Being motivated by money isn't greed. Per Merriam-Webster, greed is an "excessive desire for more of something (such as money) than is needed". The key qualifiers there are excessive and more than is needed. How do we determine what excessive employment is?

Turn it around. How do we determine what "enough" is? Ask any business person who is beholden to shareholders to define "enough" and they will tell you there is no such word.