That's a powerful headline. It's also a pile of baloney. There is no such thing as "selling out" despite the best efforts of self-important artists and fans to claim that such a mythical beast exists.
The reality is that every single artist that you have ever heard of has "sold out" to one degree or another. If they hadn't, you'd never have heard of them. The only question is the degree to which one's personal taste accepts the capitalism of their favorite artists. And that's exactly what it is: personal taste. There is no set standard for "selling out": it's just a label that someone sticks on an artist for making money in a way of which they don't approve or, in some cases, for making money at all.
The reality is that every musician who ever recorded a song is in the business to make money - as much of it as possible, for as long as possible. They may create airs that they pretend to be uninterested in the almighty dollar, but when was the last time one gave away an entire album of their work to the world? When was the last time one went on a nationwide tour of free concerts? The answer is simple and obvious: never. Actions speak louder than words, so citing quotes to the contrary is useless. Show me their free concert tour and freely released body of work or believe the truth about your favorite artist: there really isn't any middle ground.
(Before the naysayers start: releasing a single song for free is just giving away free samples to induce you to buy the full product. They do they same thing in supermarkets.)
They sell t-shirts, and CDs, and keychains, and all manner of other memorabilia and none of that is questioned. They get a cut of concession sales, appearance fees, and various other types of financial compensation without a peep from the peanut gallery. What kind of sell-out is every artist who ever went on a corporate-sponsored tour? Who is more the product of corporate promotion: the Rolling Stones or Britney Spears? The honest answer is that both are. The only real difference is only in the degree that Britney's fans tend to be more honest about how much corporate money their favorite artist accepts.