Thanks for pointing this out. If they don't already have copyright guidelines in place, I think Steemit will eventually have to implement them. There will always be those making a quick buck using other people's hard work. Imo, it's perfectly ok to curate content and post it, as long as the original content creator was contacted for permission. It all depends on the intent of the poster. In the case of the Zer0hedge curation blog, it looks like the intent was to easily get a large following, maybe even the forethought of making $$. I can see legal battles ensuing because of this, now that Steemit cryptocurrency is on the rise.
Personally I'm a little indignant at blogs that only post curated content, because I try to create original content on my page and get very little traction. Hopefully people will use discernment when upvoting and resteeming.
Cheers