> ... as it n becomes more and more obvious that the benefits of that software flow to giant integrated cloud platform providers rather than to the people who make the software.

The whole point of open source is that everybody has the opportunity to contribute to the benefit of everybody. You don't get to say "oh, but nazis / Amazon / rapists don't get to use this because I disagree with their morals".

The incentive to contribute comes from being part of a community that gets to experience better quality software. For many (me included), that's plenty. I really don't care what Amazon does - I'm neither a customer, nor an investor.