Nickelodeon's success isn't predicated on all kids liking that programming, just some substantial/critical mass of them. Same for the other examples, including BlackOakTV.
Presumably black people who like to see shows with [non-black] diversity are already having their needs met. Addressing a market whose needs are not being met has business (and social) value.
Presumably black people who like to see shows with [non-black] diversity are already having their needs met. Addressing a market whose needs are not being met has business (and social) value.