Arguments about “cultural appropriation” are usually dishonest.
Although they often take place in venues devoted to religion, spirituality, and magic, they are not about religion, spirituality, or magic.
Instead, they are political arguments about cultural survival, usually taking the form, “We/You took everything from them/us, and now we/you want to take their/our spirituality too!”
Let me propose a hypothetical bit of “cultural appropriation.”
I fetch the old Catholic missal off the shelf, blow the dust off (Colorado is dusty), and open it to the ritual for the Eucharist.
I find items to serve as chalice, platen, and all the other necessaries, make myself some cheat cards for the Latin, set up my altar, and proceed to celebrate the Tridentine Mass.
Cultural appropriation? I doubt that the Vatican will be too disturbed, and I will not need to watch out for albino assassin monks.
Is it not “cultural appropriation” when the so-called victim is large and powerful? If so, that makes me think that all talk about appropriation is merely politics.
So what are the consequences of my unsanctioned Mass? From the Catholic Church’s viewpoint, Aquila non capit muscas, I suspect. Any other consequences?
Now you can discuss the religious, spiritual, or magical issues.
Postscript: This post is somewhat based on a dream I had months ago, in which I was called up to baptize someone in some Protestant denomination, and of course I was thinking (a) what baptismal ritual do these people use and (b) since I am a Pagan, will it be “valid”?