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Nix also runs on Darwin and BSD.

Ok a bit better, doesn't change the fact it doesn't run everywhere where there is a C compiler.

Not everyone using C is writing software that turns on all platforms supported by any C compiler?

Not everyone using C cares about UNIX FOSS clones.

Not everyone is writing C software to run only on their own laptop.

I'm confused, do we expect end-users to install a language package manager to use software? Nix would only be used wherever the software is built.