I remember how Zomato used to show upcoming sections in their app.
I have seen payments and ordering as coming soon in their app even before I discovered Swiggy or Momoe or Inresto.
Would love to believe that Zomato was following Zuckerberg's strategy of entering new markets. Unlike Google, he waits for products to reach a significant presence or scale to either acquire the product or ends up cloning all features.
For the war, it's best that they find common ground - merge or kill.
It's also completely okay to survive separately, think Cleartrip vs Tripadvisor/HolidayIQ.