> If you cannot own things you create, there is little incentive to create and share those things

How do you explain the creative works of writing, music, and art that existed in the millennia of human history between the Mesopotamians and the Enlightenment era?

They tended to be solo productions, or sponsored by aristocratic patrons. Anyone suggesting that we could create movies, TV, music, or games on the scale we do today, without copyright, does not seem worth taking seriously.

Copying was prohibitively expensive.

I support copyright reform, but that history has a large portion of "get lucky while sucking-up to the local rich dudes for a patron", which... isn't ideal either.