There are only 3.5 billion jobs worldwide. A good amount of those work for the government, in the army, in the public sector, etc…
I’d be surprised if it manages to get above a billion to be honest. Remember that copyright is a fairly recent invention.
If you copy everyone else you’re not going to be profiting much, as your product isn’t competitive. You have to keep iterating on an idea to stay ahead of the competition.
IP law lets companies stop innovating after they’ve come up with a product, because other companies cannot directly compete using the same or a similar design.
Did Android phones stop innovating because Apple did a smartphone first?