Sure there are some runaway indie hits that make money to cover the development. And Linus Torvalds gets paid $10 million per year to work on open source. But nearly all indie game developers never make anything from their games, same as OSS authors. (Indie games are an the appropriate comparison since we are talking about independent OSS authors, not Facebook developers working on React).
In any case, I am not arguing that all of these endeavors are equivalent in all ways. My only point is that all of the fields have an oversupply of creators. The result is that creators don't have leverage over consumers. To really spell it out: if OSS library creators try sticking the commons clause or other "innovations" on their projects, most businesses are just going to go find another library that does the same thing, without the restriction.
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.
That's almost exactly the opposite of very popular OSS software, which generates an endless wave of free users. And generally no whales. And high demands for bug fixes. And serious temper tantrums (this has happened to me too) when you explain to users of your free software that you owe them exactly fuck. and. all. and won't be hopping-to in order to fix something for them.