I do think the argument of a maximum value to contribution is more difficult to make with an artist as the example. Especially one as prevalent as Taylor Swift.

Art is intended to illicit emotions from people. Music in particular continues to illicit those emotions from years after it is released.

Are we then saying that the value of people feeling joy has a cap?

I don't necessarily disagree with capping the income of an artist. I'm just pointing to the danger of using them as an example.