Hear that, folks? In a world that's increasingly focused on sustainability and funding for software development, programmers with business aspirations should take note:
If you're working on something that you hope to (eventually?) make money from, but you also want to benefit from the collegial atmosphere of open source, then choose the GPL. This simple decision instantly eliminates a whole subset of would-be competitors, who you now don't have to worry about undermining your business or otherwise threatening your source of income while they rely on being able to use your own work against you, since the GPL automatically places your work in their do-not-touch category.
If you're working on something that you hope to (eventually?) make money from, but you also want to benefit from the collegial atmosphere of open source, then choose the GPL. This simple decision instantly eliminates a whole subset of would-be competitors, who you now don't have to worry about undermining your business or otherwise threatening your source of income while they rely on being able to use your own work against you, since the GPL automatically places your work in their do-not-touch category.