Thank you Tina for your reply. I agree with your point about appropriation being an artifact of power dynamics and that it is not reversible; if the hegemony coopts a story from a subjugated people, the risk of appropriation is quite high. Almost (but not completely) unavoidable. If a subjugated people tells a story not their own, on the other hand, cultural appropriation is less of a pitfall (though not absolutely zero). And in the case of multimillion-dollar feature films, the profits benefit the studio, not the culture from which the story comes--this, to me, is the biggest issue.  

However, it does not follow that because there are a lot of Jewish people in Hollywood, a film made by a non-Jew about the Holocaust would (or wouldn't) be a form of appropriation. That is a non-sequitur that itself borders on racist, though I don't think you meant it that way. And I do urge you to watch "Embrace of the Serpent" for an excellent cinematic treatment of an indigenous story.