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Aren’t Creaive Commons licenses not suitable for code? Can’t find a reference but they seemed pretty clear about that.

Correct, Creative Commons recommends using alternate licenses for code. See “Can I apply a Creative Commons license to software?”, https://creativecommons.org/faq/#can-i-apply-a-creative-comm...

Creative Commons licenses are good for documentation and manuals.

You are correct. And yet I've found multiple cases in which they're used for code.