The meaning is that capitalist structure and incentives will necessarily lead to exploitation of culture. There is no moral dimension to this statement: it is merely a causal relationship based on how commerce works, how human psychology and purchasing behavior works, and what art and culture are widely accepted to mean. Commerce does not accommodate our ideas about cultural enjoyment very well due to the way it fundamentally functions. Them's just the breaks, and it's no more punitive to point it out than saying water is wet.
That meaning you're touching on by asking, which is what commerce means in relationship with the arts, is graduate-level theory that you could doctorate in, and remains one of the most debated topics in modern times with the unique twist of cultural leaders outside academia usually being the voices that teach us well. Try concretely defining cultural exploitation, for example, in a way that sets aside personal perspective on the concept. I'd contend it's insoluble.