Because previously if you honed your skills as a musician there was a chance that you could do it for a living, so there was another incentive to get better. Electronic tools just facilitated human creativity, but the random listener couldn't sit down with a synth or a DAW and just press a button to get music out. But if all the money drops out of the music industry because the consumers can auto-generate unlimited music, how will that work?
Furthermore, generate music based on music you created. They're alienating the labor of the musician then using it to drive that musician ut of their livelihoods. I feel like pro-AI people constantly miss this point with inane quips about the printing press. Artists created all the value and get none of the reward.
