Again, incentives.

The people who publish are people who have reason to publish when they can be copied. Typically either they have already been paid, or they expect to gain market share by being free.

People who need renumeration to continue working will not publish.

Intellectual property rights, as much as I dislike the RIAA and MPAA, created a way for more players to enter the market, because it created a way for their needs to be met.