"Unpaid work" is pretty much all OSS development. "Here's a thing I made, anyone can use it for whatever they want as long as they give credit" is a very simple philosophy. Not everybody who works on OSS is opposed to the existence of closed source commercial software, and rather a lot of people don't like viral licenses like the GPL. Really out of line to call people who contribute their time and effort to making free software available to everyone losers just because you disagree with their choice of license.