Looking at the C&D letter, it seems that Zillow is saying any use of their site for commercial use is prohibited. Wouldn't that cover traditional print journalists doing a similar story, or any story that made use of information gleaned from Zillow?
Why didn't Bloomberg receive a C&D for this story which says "Bloomberg used data from the U.S. Census Bureau, Zillow Group Inc. and Bankrate.com to quantify how much more money millennials would need to earn each year to afford a home in the largest U.S. cities." http://www.bloomberg.com/news/articles/2015-06-08/these-are-...
I guess nobody except the EFF really wants to take on this type of fight.