Hmmm, ArtUntamed might want to clarify something about the terms. They say,
We may suspend or terminate your access to all or any part of ArtUntamed at any time, with or without cause, with or without notice.
You are granting us with a non-exclusive, permanent, irrevocable, unlimited license to use, publish, or re-publish your content in connection with ArtUntamed.
So ... if they ban a user, they consider it to be in their right to still re-publish that banned user's content because they gave permanent, irrevocable license?