Not so much this, just that in order for people to have a similar level of impact they need to have a huge amount of resources behind them to get any kind of attention. There is no way Rashford would've been able to achieve what he did without the backing of his talent agency. That's not a slight on him at all, it's just reality of the world we live in today. It's the same for white people as well fwiw.
I sincerely doubt Rashford launched the campaign solely to boost his image and marketability, it was simply an inevitable conclusion of the campaign.