I imagine it's about prevention rather than discipline in their eyes. I'm not defending the idea (who cares if we see chun li naked? There is much worse on the internet) but I don't think blacklisting the player would assuage their fears of it happening in the future.
What we really need to do is start writing down all the Lemmy instances. It's one thing to tell off reddit, it's another thing to get people off of reddit.