And they give nothing back. No money, no developer hours. They take the fruits of a fledgling ecosystem and experience great productivity and performance improvements in their commercial products and reap increasing profits on the backs of people who naively just thought "I just want people to be able use my code is all".
The third wave does not recognize the tremendous costs associated with giving away productivity to corporations. It costs society broadly, because it empowers business interests to exploit workers and customers for greater revenues not through their own ingenuity or innovation but through the labors of others given away freely. That isn't being generous on the parts of the developers who wrote the code for those that most need generosity.