It's a terrible practice to pollute art that is owned by the public and ultimately belongs in the public domain. Are they going to come back 75 years later and filter out their data sewage?
I can go get a course of antibiotics if I have to eat shit soup, but ruining the data ruins it forever.
It's the artists own work, they can do whatever they want with it. If people don't like that they should be filtering this out of their dataset before training.
