The big difference is that those Indie games make money for no one. It isn't like there is some giant cloud company hosting your indie game and selling it to consumers and cutting you out of the equation. There is no demand for that game. On the OSS side there is often huge demand with no compensation to the developer. I'm not making a judgement on whether that is good or bad, I assume most OSS developers know that is the way it works, but I am saying that it isn't comparable to a bunch of games that have no demand and people are making them for their own satisfaction.

I have an OSS project used by 1000s of people and many huge companies. I don't get compensated for that directly and I don't expect to. I'm just happy to be able to use it on my own projects no matter what company I am working with.