Zillow’s listing standards policy is slated to go into effect on Monday, but not if Compass gets its way with the court.

Compass says that Zillow has implemented an exclusionary policy that says if a home seller and their real estate agent market their property off Zillow for more than one day, that Zillow and its allies, Redfin and eXp Realty, will ban that home from being listed on their search platforms.