P.S. It's Not About NOAI Tag. It won't save us. We need ArtStation to protect us from being used for generating NSFW AI images, and we need ArtStation to protect the quality of the platform by NOT letting AI images be uploaded here. Just adding NOAI tag won't save us from them. 
We need serious action and we all need to unpublish our artworks from ArtStation if they don't protect us.