This is not a SFW instance. NSFW communities will be tagged, and efforts will be made to keep SFW communities clean, but proceed at your own comfort level.
Have they ever saved an image they saw online to use in a different place (wallpaper, repost the meme, etc.)? What is so different from someone using it to train their own model which they use for themselves?
They are just going to start discussing the ethics of stolen training data