The printing press changed the world but it was huge expensive hardware and if you had one it meant you were a major industry player and therefore an easy target for copyright enforcement.
Copiers were also expensive machines owned by businesses and they also worked with physical paper. There were inherent limits to the scale of any copying operation.
None of this is comparable to what we have today. Now everyone has a computer that fits in their pockets and is more than capable of instantly creating an unbounded number of copies of any data at nearly zero cost as well as transmitting those copies to anyone else connected to the global network. People infringe copyright every day, most of the time without even realizing it.
