Obviously, anyone who made anything popular and permissively-licensed has undergone such regret when corporations scooped it up and used it gratis without contr

Obviously, anyone who made anything popular and permissively-licensed has undergone such regret when corporations scooped it up and used it gratis without contributing anything back. Lesson: if you use a permissive license, you are acknowledging that your work is worth nothing to you. Because that's what you'll get for it; whereas it may easily be worthwhile to sell a proprietary-licensed binary of your copylefted work.