The clash between real estate giant Zillow and Bay Area brokerage Compass just hit a new level. Starting June 30, Zillow will begin banning certain "pocket listings"—exclusive properties marketed privately by Compass before hitting the open market.

Zillow’s new policy gives agents just two strikes—violate the rules three times and your listings could be banned from Zillow indefinitely. Meanwhile, Compass is holding firm, accusing Zillow of monopolizing listing access and limiting seller freedom.

Even Redfin and Homes.com are picking sides. Could this shape the future of how homes are marketed in America?