1. You know that these tools are known to sometimes output a result that is 1:1 copy of a work from training data. Even those cases aside, in many (most?) cases a few or even one specific artist served as the source (sometimes the prompt is specifically created that way).

2. Human mind can recombine all it wants. It’s called a homage, a reproduction, or a cover. When a software tool does that automated and at scale, though, it is copyright violation.