But it's not "from each according to his ability". FOSS is what people feel like contributing. And it's not "to each according to their need". It's take it or leave it, unless someone feels like fulfilling requests.
Traditionally, the slogan meant a duty to work. Contributing what you feel like is just charity.
Capitalism, at its core, is private control of the capital. Copyright law turns code into intellectual property/capital. I've read the argument that copyleft requires strong copyrights. That argument implicitly makes copyleft a feature of capitalism. You know how rich people or corporations sometimes donate large sums to get their name on something, EG a hospital wing? That's not so different from a FOSS license that requires attribution.
FOSS works with the quoted text for the same reason piracy is not technically stealing. How do you make the quoted text work with physical goods or services? How do you allocate the work of a cosmetic surgeon, or distribute nail polish?
Edit to give examples that are more cis male oriented: how do you distribute viagra in an equitable manner? Basically I am asking where do non-utilitarian services or Veblen goods fit into this paradigm. Technically we don’t need computers to survive and mate, so that mitigates the need for FOSS
Needs more pixels
Ah yes, nyehh
