> If other cultures should be allowed to duplicate any of our cultural or economic artefacts wholesale if they choose, doesn't that work the other way around?

It does. In my opinion, cultural appropriation shouldn't be a thing. It's a big deal in the US, but Greeks, Turks and Slavs have copied each other's language, food, songs, and mannerisms for centuries and we're better off for it. It's remixing.