I am not American but the overwhelming majority of the media I consume is American. Given the near hegemony of American popular culture, that is likely true for millions of non-Americans. All these people consume American content because they find it enjoyable and at some level relatable despite living in very different countries and not speaking English as their first language. At the end of the day, the human condi…
The context you're missing here is that "Black culture" in the U.S. really means "a blend of many African cultures of only poorly-known detail, plus a dose of some parts of western European culture, as heavily mediated by slavery and discrimination". It's associated with skin color most predominantly because that's the connecting factor for most people who were stripped of their original cultures and forced into slavery.