I had an experience where someone posted my Steemit song video without giving me credit. A lot of people voted them down and left comments, so they changed it to link to my post. In that case it should have been obvious that it was a Steemit user. I even had my link on the video.
I'd love to see ways to share Steemit posts in a way that shares the earnings with the original author. Perhaps have some other ways to do it, e.g. if someone does a guest post. It should be automated as much as possible.