If you browse LAION (e.g. using this [0]), which SD uses you find all sorts of owned IP there (shutterstock, artstation, fanart from deviantart and tumblr etc.) - because it's a research data set. LAION has a disclaimer that it does not claim ownership and that any troubles you run into by using the graph are your own.

[0] https://rom1504.github.io/clip-retrieval