People like this truly don't understand what most people actually enjoy about music...
Music is an artistic expression of some human being's thoughts and personality. Yeah, you might enjoy the melody, rhythm or chord progression of a song. But there's also so much embedded in the emotional content and lyrical themes, as well as the character of the performer(s) themselves.
Take The Beatles for example... You might like the music or not. You might like the people or not.
But odds are you know at least something about who Paul, John, George and Ringo were, at least in their public/creative personas. Even a basic listener can sense the catchy pop songwriting that comes so naturally to Paul McCartney, and they can also pick up on the artsy psychedelic vibes of John Lennon's contributions. On top of that, someone with an ear for music can hear a quintessential George Harrison guitar lick, or a classic Ringo Starr drum fill.
The Beatles were a pop culture sensation, not just because of their music, but also because of who they were as people--and that's basically true for every famous artist or musician, because personality is extremely important.
I think people would be a lot less interested in songs that were entirely detached from humanity, and so I can't imagine a future where anyone ever gives even the smallest shit about some slop song generated using stolen music on some app.