What you said about the NBA and NHL, as well as the private sector in general, are also true. That doesn’t negate my point about the NFL; it simply means they’re all guilty of exploiting the players. I imagine you’ll ask where’s the racism in the NHL if most of the players are white, and to that I would reply that economic exploitation and implicit, structural racism are two separate circles that happen to overlap in the NFL, and perhaps the NBA as well. I guess you could argue that race has nothing to do with it in any of the cases, but I think economic exploitation is actually a fundamental — and arguably the worst — part of the racism equation in America, so the two can’t really be decoupled.
You also said that the NFL is responsible for bestowing generational wealth upon thousands of black families. While true, that’s a poor argument: those folks are a tiny, tiny fraction of black families in America. Real power lies in the ownership of assets, and as far as I know the average American black family’s net worth is negative, or at least much lower than the average family.