Does Steemit have a plagiarism problem?

I've seen a number of posts that were just carefully reworded post from a popular website or in some cases a direct rip. I'm not saying that all content must be completely original, from your brain stuff. But those references should be mentioned in your post at least. If you're going just copy and paste someone else's work you might as well quit now. It goes against the spirit of Steem. I know we're here to make some money but don't let greed get the best of you.