Copyright incentivizes many authors to undertake works they normally might not due to the protections copyright provides. Many authors (who freely publish their books under copyright) probably wouldn't be able to spend 3 years researching and writing a book if they weren't able to get advance money from their publisher.
One is free to use a liberal license or a more restrictive license, both are out there and available to creators.
Copyright incentivizes many authors to undertake works they normally might not due to the protections copyright provides. Many authors (who freely publish their books under copyright) probably wouldn't be able to spend 3 years researching and writing a book if they weren't able to get advance money from their publisher.
One is free to use a liberal license or a more restrictive license, both are out there and available to creators.