If you were a painter who who makes art for a living, does it really seem “fair” for someone else to take your work, without any sort of consent or compensation, and use it to produce other works that are in direct competition (for time, money and attention) with you? How is that “fair” in any sense of the word?
This is exactly how it works in the real world. I can go teach a class* on how to imitate the art style and techniques of any living famous artist, and as long as I’m not knocking off a direct copy of their pieces, it’s kosher per copyright law and per social norms.
I could even show the artist’s works unaltered in those classes as long as I’m doing so to comment educationally.
That’s been the standard for literal centuries and most creatives are not offended or upset by it. I personally would not at all be offended or considered it unfair if someone taught a class on how I made things I showed publicly.