It's an interesting one for sure. I wonder how it would apply to Hip Hop, for instance. Rapper has deal (money/product/whatever) with a brand and endorses them through song. We don't really have liner notes anymore, but it's clearly paid promotion. I appreciate this isn't a 'post', but the article talks about sitcoms. And if you take music as 'art', there's probably a case where you could argue your instagram/video/whatever was 'art'.