You're right. That's where the exclusive vs. non-exclusive copyright license comes into play. I also wonder what this will do to the rentals market. For instance, local realty company lists all their properties on their website and posts them on Craigslist to increase traction. Craigslist now sends the realty company a takedown notice, for the realtor's website listing, since they copied the listing onto CL. Depending on the level of enforcement CL pursues, this could have the effect of cooling professional usage of CL--especially by organizations that have to run things by legal first.