But more importantly, most of them don't really care beyond "oh copyright's the thing that lets me sue big company man[0]".
The real impediment to CC-licensed creative works is that creativity resists standardization. The reason why we have https://xkcd.com/2347/ is because software wants to be standardized; it's not really a creative work no matter what CONTU says. You can have an OS kernel project's development funded entirely off the back of people who need "this thing but a little different". You can't do the same for creativity, because the vast majority of creative works are one-and-done. You make it, you sell it, and it's done. Maybe you make sequels, or prequels, or spinoffs, but all of those are going to be entirely new stories maybe using some of the same characters or settings.
[0] Which itself is legally ignorant because the cost of maintaining a lawsuit against a legal behemoth is huge even if you're entirely in the right
