Yes, the dataset is an issue, and generated art can be also infriging copyright holders (eg. no idea what Disney might think about https://lexica.art/?q=disney ) . Artist are suspicious that the dataset already use large part of Artstation and DeviantArt. For ArtStation; Epic Games boot it not long ago, and of course have a license on all the art here. That could make them in position of offering a commercial tool that use 'Ai' with their database.
@davidrevoy @Natanox another story of big companies using free labor to consolidate their position of power… i do hope we will get a healthy space of open datasets and constructive use of machine learning in art.