A majority of people who listen to and consume rap music are white. In the 90's, tons of white people wore FUBU (a clothing brand whose name is an acronym for "For Us By Us").
So I don't think the article is only getting at corporations stealing black teens' viral content, but corporations taking ideas from black culture in general, with viral content being a specific instance.
I am currently homeless. I face a lot of classicism for being open about that online. The cherry on top: When folks tell me the shitty treatment I get is my fault for being open about it. "No one knows your dog online if you don't tell them." In other words, the prejudice is a-okay. If I want to be treated like a person, it is on me to hide my status.
I have reason to believe this approximates the experiences of a great many other groups that are de facto second class citizens.
Seriously, what does your race have to do with how right or wrong you are?
I assume that when someone posts "IANAL, but..." you also get upset about it?