I think you do not understand why people are angry with Amazon. Say there is a dude that discovered that he can make money if he sells coffee cups with black cats painted on them, Amazon then runs an SQL query or run some ML and find all profitable products including the coffee cups and they then find where the dude buys the cups , negociate a better deal with the manufacturer, make tons of money and the dude gets frustrated.
Unity making 2 games would not upset the developers, they could make the game "open" for all customers so anyone can learn from them.