Not to be argumentative, but there is some justification to the idea that a bunch of white British boys, The Yardbirds, may have save the blues from the dustbin of history by putting themselves in the middle of it. Back when music in America was divided as music, and race music, and cringe-worthy blackface, musicians were listening to each other and adopting what they liked. That went in both direction and the result is the wonderful diversity we enjoy called American music.
I mention it because I’m an old guy who has done a great deal of world travel and everywhere I’ve gone I’ve found things not native to their culture. Imitation can be a sincere form of flattery.
I understand that it is reasonable to dislike people like the ones that you mentioned passing to gain advantage while avoiding the misery of the mistreatment of the people they imitate. That point is not lost on me. Perhaps I was just snagged by my knee-jerk to the word appropriation since I am very eclectic in my tastes but don’t think I’m fouling anyone. Thanks for responding to clarify.