what makes that ok

well, the difference is that humans are quite well autoregulated system... as new artists are created by learning from the old ones, the old ones die, so the total number stays about the same. the new artists also have to eat, so they won't undermine others in the industry (at least not behind some line) and they cannot scale their services to the point where one artist would serve all the customers and all other artists would go die due to starvation. that's how the human civilization works since the dawn of the civilization.

i hope i don't need to describe how ai is different.