You'd have to find a way to determine how much of each artist contributed to every output from every prompt, find every artist that had a work used in the training data, and get them all to agree on how much they should be paid. Then come up with a pricing model to sell the art created that people will pay for.
All that to get to the Spotify problem where the money coming in is distributed to so many artists, that nobody makes any money, except the company selling art makes a ton because they take a percentage off every picture.
In the end, the artists feel just as screwed over as they did before all of this.
