About visual artists on fair use, I don't have personal examples.
I'm sorry, I'm bad at thinking on the spot like this, but an example that you could potentially look at, which goes to your use of the terms “passion” versus “industry”, is that of an artist on the the east coast recently. You may be aware of this story, where the CRA is charging this artist over $30,000, I believe it is, in taxes because they have deemed his practice to be a hobby, and deemed him to be a hobby artist.
The Canada Council for the Arts and other arts funders have a definition of a professional artist. It is an industry of sorts. While these people are passionate about their work, I still think it's important to recognize the professionalism that goes into it, which is why we keep saying that you should defer to the artist, because they have had to become professionals in order to protect themselves. Also, they go to school, or even if they don't they spend their lives doing it and they deserve that recognition. The danger really is that they could also be disrespected in this way of being called a “hobby artist”, or saying it's a passion rather than a job or their life's work, which then allows a blurring of lines to give maybe less agency to the artist.