The copyright system is what has enabled so few companies (and one giant corporation in particular) to become the owners, controllers, and beneficiaries of the vast majority of American fiction and culture. From visual media companies, record companies, and publishers, you can probably distill ownership of more than 90% of the culture that the average American lives in to fewer than 20 companies.
Copyright has been the most powerful tool in any media company's toolbox when it comes to consolidating power and IP and rolling into a larger and larger ball of what we call culture.