Exactly. Usually on sites like Reddit, it's not a problem unless the person posting the video claims ownership when it's not actually theirs. Reddit Karma is worth nothing, so it's no big deal if someone rips off someone else's content and gets highly upvoted for it, but on Steemit that could be a really big problem.

Even without the issue of claiming ownership, that raises the question of whether it's ok to post "Here's a cool YouTube video I found" type posts, or whether everything on here should be strictly original content, or public domain.

I suppose those are questions which will have to be answered one way or another if this place makes it big