I'm sort of a copyright 'moderate' I suppose. I think people should get paid for their work, and trying to just rip-off a single person's style (and I'm not at all saying this particular example was nefarious in intent) just feels gross. But I also think too much baggage and we stifle new ideas an innovations.
However, I also think that most of the conversation around large models like StableDiffusion lack an understanding of how these models actually work. There's this misconception that they're a kind of 'collage machine'. The contribution of individual artists in these base models are like drops in a vast vast ocean. [edit: I repeat myself; recovering from Covid, forgive me.] They take this incredibly large set of digitized human creativity, and in turn we all get this amazing tool: a synthesizer for imagination.
Anyway, just my personal opinion. It's become a very 'us vs them', lines-in-the-sand argument these days, and it'd be great if the conversation could be less heated and more philosophical.