Tank you for your response. How could I not have found this study myself. Pretty sure that it will answer a lot of the questions I have and probably will have while digging deeper into the subject. This really helps me.
I will now have a read of the study and blog post of Mr. Stamos. It is also good to know that server admins and moderators seem to act fast on those issues. Moderation is always a delicate thing but when it comes to illegal content it is really a must have.
Thank you for your reply. Neat that there are already APIs which technically would enable some kind of automated moderation. But I understand that automation is critical. Especially since ML Algorithms have problems with context.