Agreed - I saw you catch someone within moments of them posting. I think there are a portion of users that just don't know better and should be taught that it won't fly here and then there are the true spammers.
I've also seen plenty of posting under theoretical 'fair use' laws for images. Steemit is a commercial platform - you ought to get written permission to use images that are not in the public domain. For more information: https://www.law.cornell.edu/uscode/text/17/107