Having dedicated cultural venues or channels for a subculture isn't the same thing as like segregated bathrooms. It's more about appealing to a niche audience that isn't lucrative enough for a mass market purveyor. It's not really different from genre channels like sci-fi only or comedy only except that it's geared to an ethnic demographic who want more representation in their media. When a giant company like Netflix is allocating budget for new content, they will get the most returns by appealing to the largest of broadest groups.