Because I care more about that my software was found useful enough to be used, less so about by who and why? This is the main ethos behind licenses like BSD and MIT and APL. That, or I don't care enough to take a stance on license politics, and the BSDlike licenses are the only way I can put my work out there whilst giving any prospective downloader the least amount of need to think about license politics.
I don't share this "those evil corporations!" mindset that tends to drive so many that choose a GPL-series license.