Food Delivery App Development Inquiry

I'm exploring the possibility of developing a food delivery app akin to Uber Eats. I have some questions about its feasibility and worldwide operations. Key Considerations: - I am currently unsure whether to develop this app from scratch or modify an existing one. - The app should ideally encompass diverse functionalities, such as real-time GPS tracking, payment gateway integration, and a comprehensive restaurant management system. - The app needs to support multiple user roles, including customers, drivers, and restaurants. Ideal Skills and Experience: - Extensive knowledge in app development, preferably with experience in food delivery apps. - Proficiency in integrating real-time GPS tracking and payment gateways. - Experience in developing a multi-user role system within an app. - Understanding of global app operation standards and requirements.