Copyright was invented with the printing press. What was happening was that authors couldn't get compensated, because everyone with a printing press was re-printing their works. It never gave the author control over where their books were ultimately sold; just who could copy it.
Related: This is why the Bible became so popular and well-known. Printers could re-print the Bible because it wasn't protected by copyright.
That was never the point.
Copyright was invented with the printing press. What was happening was that authors couldn't get compensated, because everyone with a printing press was re-printing their works. It never gave the author control over where their books were ultimately sold; just who could copy it.
Related: This is why the Bible became so popular and well-known. Printers could re-print the Bible because it wasn't protected by copyright.