They're mostly posting incorrect claims like "all it does it make collages out of other people's art" though. It doesn't do that; the model stores about 1 byte per original image it's seen.
AI will need some favorable legal precedents to avoid getting banned though, or else they'll have to only train off CC0 Flickr/Wikipedia scraping.
I also think it's a more obvious problem that it can reproduce copyrighted characters by eg prompting for "Homer Simpson".