If a business is worried that their open-source software is going to backfire and feed the competition, they have no interest in open-sourcing their software in the first place, and no license restrictions will help them.
GPL's other effects (forcing businesses to open-source software they make modifications to, which are covered under the GPL) are good enough.
> I believe that every software owner deserves a copy of the source, but I don't believe that every software owner has the right to redistribute that program practically without limitation as the GPL allows.
I'm not sure you realize how unrealistic that artificial approach is becoming.