[ijk]

Notice that none of those are video games. It's great that lots of creative work is being licensed under CC BY-NC-SA, or even CC BY in a few cases. But most of those have something else they can sell later, like a physical book or cards, or are otherwise able to completely fund the entire process from the pledges. So they were able to open-source the product, have a free version, and still make enough to survive. That's not quite the same thing as completely releasing an entire game for free, although they may appear similar at first glance.