The only thing better about these than any other I have heard is that the synthesis quality is better. It just sticks cliches into new contexts and like riffusion and the rest probably has no ability for the longer structures and developing the piece over time in an effective fashion, hence the short samples.

If copyright was the issue than we should have AIs that can effectively do older styles of music which have a great deal of public domain music to work off of, but we don't.