In the case of cryptokitties, they have sections in their terms of service that say that they own all of the images, all of the graphic elements and that they have the right to use them however they want.

就加密猫而言，他们在服务条款中有部分表示他们拥有所有图像、所有图形元素， 并且他们有权随心所欲地使用它们。