Appropriation has at its heart guilt and it is usually a projection that a consumer of information likes to use as a indictment to compel someone to conform to their standards.
I think I largely agree with that. And it should. You SHOULD feel guilty for taking a dying language, writing a novel in that language, that in no way acknowledges the culture that language was taken from and then profit (somehow) from it? Yeah, that's pretty despicable. That's bottom feeding.
If I write a novel entirely in Ainu language, and yet completely ignore the genocide of the Ainu people over the past century, and somehow, probably because I'm white and have enough privilege to market such a book in such a way that it makes money, then, yeah, I'm a bottom feeder.
When, over the course of history of most of our nations, we have perpetrated incredible crimes against these people, profiting from their culture by yanking from it and pretending that what I'm doing is original and not related to that culture, is morally bankrupt.
It's the Nazi themed restaurant opened in Seoul, owned by Koreans, and catering to the prurient. It's pretending that only Japanese culture matters in Asia and all other cultures are secondary. It's using language to justify why we can kill this monster (note, this language is not repeated anywhere else in the game) that word for word mirrors the language real world people used to murder real world minorities, in the twentieth century.
On and on. Is it about guilt? Well, yes. We have every reason to feel guilty. If you look back at history and feel no guilt, there is seriously something lacking somewhere in that equation.