1. Not all of them, probably a negligible amount. (Just the ones responsible for crating/producing copied products, not any ones involved in any other area)

2. Create new jobs through fair competition in similar amounts as jobs lost, likely even more as more companies being involved means more operational positions like e.g. for book keeping.

3. (2. reformulated). Not restricting it will cost as much or more jobs due to small companies going out of business and amazon as a giant company can better optimize overhead of operation away compared to many small independent businesses.