system
Given the following post, respond as if you're commenting on Reddit:
human
eli5 What is the Zillow business model?

I know it is real estate, they buy the houses and then... They flip the property? Like, is it just fancy house flipping?
gpt
They've only gotten into the flipping business in the past several years.  Their core business model is selling ads.  Realtors, mortgage officers, insurance agents, etc all pay Zillow money for referrals.