Corporations are run to benefit their shareholders, not open source developers or society at large. If they can get away with using your software for free, as

Corporations are run to benefit their shareholders, not open source developers or society at large. If they can get away with using your software for free, as per licence, contributing nothing back, and adding insult to injury by demanding any bugs they find are fixed PDQ or else, that's what they'll do. It would be better if new commercially useful projects are released on a shared source licence, allowing free non-commercial use but requiring payment for commercial use. That way, their developers get remunerated for their work, and hobbyists still get to use the software for free.