Because that's not how it works.
I know that you likely intended to imply that you can subsitute the aformentioned AI music with an existing piece of music of the same genre, but that is not a view shared by all. Sometimes the generated music scratches such a specific and personal itch, that it cannot be replicated by something in the same genre.
A better counterargument to your original comment would be "It is not an exclusive situation. I can listen to and support both generated music and handcrafted music at the same time. They both contain music tracks that I like."
To be more specific about the second sentence, if there are any readers in doubt:
> The generated music wouldn't exist without the foundation of stolen music made by people.
The word "stolen" is a value judgement that is not shared by all. It is a word meant to invoke an emotional response in the reader. For example, Stallman has argued that the data could not have been stolen, or else it would not be there anymore. So, removing this word gives you:
> The generated music wouldn't exist without the foundation of existing music made by people.
Which is a true fact that has never been in debate.
However, this is not relevant to the main point that not all generated music has a suitable handcrafted substitute, and that there is no actual need to choose exclusively to listen to generated or human crafted music. Furthermore, the conversation has turned uncivil (the first sentence). Therefore, goodbye.