I'm not going to say cultural appropriation isn't a problem, but I think you're taking it too far. Cultures have been diffusing and expanding forever, and when you take a particular trait back, it's probably "appropriation". Let's use you and Japan as an example. Practice any religion other than traditional Shinto? APPROPRIATION! Buddhism and Hinduism originated in India. And let's not forget how Japan sent thousands of people to China to "appropriate" their culture in the Tang dynasty.