Can I get my Zomato or Swiggy customer list when I stop using the app?

No. Zomato's terms say restaurants may use customer data only to fulfil the order, not to build lists or send unsolicited marketing. People who were already your customers, or who opt in directly with you, are different.

• Order only: use customer data only to fulfil that order.
• No lists: you may not add it to a list, resell it or send unsolicited messages.
• Exception: the limits do not cover existing customers or people who give you their data and opt in.
• What to do: invite customers to order on your own link, where they give you their details.