Then you should stop producing Free Software right now. Others can both use and sell your Free software without recompense. See also, Red Hat.
In a world without copyright, I would continue to produce software in a world without the GPL. It's not like I receive remuneration for Free software that I produce now, nor that others bundle and resell.
I would _not_, however, release the source code except to close, trustworthy friends. If others were to want to find out the secret sauce, they'd have to reverse-engineer it, like they do now.
Copyright © 2018, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds