People like to say "you can't actually steal IP, you get to keep yours". Of course you can steal IP, by using it or redistributing it without compensating the creator, you reduce the value of their IP. You stole from them by taking part of the value of the IP for yourself, robbing THEM from having it.
Scenario: an inventor invests 10 million for a product and makes 20 million in sales. He goes to invest the 10 million profit in his next invention.
Alternate scenario: an inventor invests 10 million for a product and makes 1 million in sales, because competitors use his IP for free and saturated the market. Inventor goes bankrupt.
Call it anything you want, but to me the competitors stole $19 million from the inventor. Yes, we can't predict the future, so it's harder to argue hypothetical situations. But seriously can't we put 2+2 together?
Plus IP expires. It's not like patents and so on forever stay the property if someone. Eventually they become available to everyone in all their documented and archived glory at the patent office.