There is quite a bit of a deep discussion to be had here. I'm not sure if black people were not allowed to have black heroes. Oh, I'm sure they weren't from white companies, as there is testimony to support that. However, I think black people could have had more prominent black superheroes if more black people had cared about that, like they cared about having black music, for example. I'm not saying it would have been easy as pie for them, but it may have been if there was enough of a demand and creative spark among black people for such things. They would have created their own heroes and marketed them toward people in their communities, like they very successfully did with music.