I have been really surprised at which people I've seen doing this at some level. Just citing a source for where they got the copyrighted image is not enough. A registered copyright and notation on an image aren't even needed in the US any more. We now have implied copyright. The @steemcleaners channel on steemit.chat can take your report of any theft you see. They follow up and issue weekly reports on the actions they've taken. We all have to stay on top of this. It comes in waves as Steemit gets waves of new users. But some older Steemians have surprised me, too! Here's to diligence and #steemcleaners!