Many, many questions come to mind:
1) Who gets to specify what is and what isn't "cultural appropriation"? 
2) And what definitions/guidelines/rules do "they" use to make their judgments? 
3) Is all cultural appropriation bad? For example, if a culture which never developed a written language uses another culture's written language, is that good cultural appropriation?
4) If only the slightest amount of cultural appropriation is involved, is the work still condemned as cultural appropriation?
5) If someone's work is categorized as cultural appropriation, can that person appeal? If so, to whom?
6) Should Human Rights Commissions/Tribunals handle complaints of cultural appropriation?
7) Does one need to have a blood quantum test done if one is intending to write about a culture to prove that one is not appropriating that culture? If so, what is the cut-off level? 75% (1 of 4 grandparents)? 50% (2 of 4 grandparents? 37.5% (i.e. 3 of 8 grandparents)?