https://consumerist.com/2017/08/17/zillow-admits-its-in-hot-water-with-regulators-over-lender-advertising/

Real estate listings site Zillow — home of the controversial “Zestimate” — is in the regulatory hot seat over an advertising program for mortgage lenders that may violate federal anti-kickback law.

Realtors pay to post properties on Zillow, but the website also has a “co-marketing” program that lets lenders offset some of that expense by advertising on Zillow.