I had thought something similar. Then quickly thought about how this relates to other social media, ala Facebook shares and Twitter retweets.

We should be using this site to share content that we find interesting, just as we would on any other network. That includes linking and embedding. Of course, adding ones own thoughts in addition to the link and encouraging discussion is a greater utilization of steemit.

On YouTube a content creator is permitted to play another video or game/movie content and monetize it SO LONG AS they are overlaying or interspersing their own content with no more than 10 seconds breaks. That seems to work ok for them there. I don't think I would recommend setting rules here on such things, as the decentralized censorship-free nature of most blockchain technologies is what makes them interesting in the first place, but if we as bloggers hold similar standards for ourselves and promote the content of others that do the same, the culture will organically feign in a more moral direction... in my opinion.