The “we bring you new customers” pitch that food portals is incredibly deceitful. Portals didn’t arrive on the scene with millions of customers to send to restaurants. They arrived with zero and siphoned them away using these dirty tricks (mini sites pretending to be made by the restaurant, phone numbers owned by the portals, requiring the portal stickers on the restaurants’ windows).
This blog post shows what happens when restaurants decide to leave portals: https://www.flipdish.com/ie/the-effects-of-leaving-costly-fo...