What a portal listing actually is
Zillow, Redfin, and most MLS feeds give your listing a URL like portal.com/homedetails/12345_xyz/. It looks identical to every other listing on the platform — same header, same template, same recommended-listings rail running down the right side.
That sidebar is a feature, not a bug. The portal makes money when buyers stay on the portal. So every page is designed to keep them browsing — including browsing the home down the street that’s $20k cheaper.