"One participant at the retreat noted that permissive licensing was a profound collective mistake, serving as a legal mechanism that enabled the world’s largest corporations to cannibalize volunteer labor..."

Agreed. Linux and GNU did and still do so well because of the GPL. Red Hat built a billion dollar business on GPL software. Tons of Linux developers are payed great salaries by competing corporations that otherwise collaborate on Linux, because none of them are allowed by the GPL to make proprietary changes to the code