That's not how it works in practice, however. As of late, most of the cries of "cultural appropration" have come from people outside of the "appropriated" group

That's not how it works in practice, however. As of late, most of the cries of "cultural appropration" have come from people outside of the "appropriated" group, white-knighting for them, often in opposition to those actually part of the group. It reeks more of siloing than anything. Certain people want everyone grouped up into nice little packages that we can't step outside of, and they've co-opted the most vocal (and often times extreme) advocates of social justice to do so.