With the success of food delivery apps such as Uber Eats and Swiggy, it is vital that you do not get left behind.
Especially if you're a well established restuarant with a loyal audience, its much more profitable to have your own app .
The article below covers some of the benefits of owning a restaurant app.
https://medium.com/@danpeterjk/how-a-restaurant-app-can-help-you-grow-d21f15dc9991