Is it though? Often these days people like to white knight about cultural appropriation. Especially white people. This in itself, if unfounded, can be offensive. Sharing culture is has been immensely important in human history, and enriches cultures at large. If even a minority of a cultural has voiced it’s dissent on how another culture has been using an aspect the first culture however, that’s when there is a serious problem. I would say the only way to truly know is to ask Native Americans. Although as others have mentioned, this concept one is in a few different peoples, my point remains I think. It’s up to the culture who the concept belongs to to decide whether or not is being misused, corrupted, and/or callously and unfairly adopted, not privileged individuals who have nothing better to do than get a rush from taking umbrage. That all being said, it is a tricky thing. How we gonna go ask every culture if it’s okay to adopt this or that aspect?