Can you expand on this point? Having no copyright being a leading cause of industrial expansion seems pretty tenuous. Especially given that they now have copyright and other countries also had booming economies at about the same time.

The printers went looking for things to print, and they printed anything and everything. The easiest way to get material to print, besides copying other printers' output, was to commission how-to manuals. Germany was flooded with how-to informational manuals on every topic.

Much like the software industry. Free software runs the world.