Cultural appropriation or cultural adoption? Could the true purpose of making "cultural appropriation" taboo be to keep minority cultures from gaining influence within the dominant culture?

Anyone can use whatever aspects of the dominant culture they like, but we're taught that minority cultures are off limits to members of the dominant culture. It's considered taboo to adopt any aspect of them, as doing so would be "cultural appropriation."

Like it's a kind of theft or something.

But how does a minority culture expand its influence within a larger culture? There are only 2 ways, reproduction and adoption. So to me it seems like the taboo of cultural appropriation is actually a mindf**k to prevent the adoption of minority cultures. They have people thinking they're preserving minority cultures, when in practical terms they're actually limiting their influence and preventing their spread within the dominant culture.