Many comments here compare the cost of a physical library to near-zero cost of the internet, but that's not a fair comparison itself.

The cost of a physical library is physical, not informational. The article describes a situation where information sharing was challenged by the industry that has a physical monopoly on media (books). They were not granted informational monopoly, they only have monopoly on physical manufacturing.

Thus the absence of physical cost (or difference in efficiency) of sharing information does not change the concept of a library.