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Let me explain it to you like you're a child:
Rabba has a carrot shop
Rabba earns money by selling carrots
One day Rabbi comes along, puts Rabba's carrots in a machine and uses the machine to print infinite carrots
Rabba can't sell carrots anymore as Rabbi's carrots are just as good and cheaper
Now kids, can you tell what's morally wrong with Rabbi's actions? That's right, it exploits Rabba's hard work. It would be less of a crime if Rabbi stole Rabba's as she could just make more, but automating her work using her efforts erases her from the picture all together.