Comment by chongli

Is it just the benefit of being able to browse in one app/website everything available for be delivered to you?

It's not just that, it's also a centralized payment system. You set up your account and you can order from any restaurant on the app without having to give them your address+payment info. Couple that with very simple, centralized dispute resolution and refunds as well as notifications of special offers. It's very, very convenient.

The economy of scale for the drivers is also much better with a centralized model. Instead of every mom and pop restaurant having to hire their own delivery staff there is one centralized pool of drivers available to everyone. A lot of restaurants just don't get consistent enough demand to hire a full-time driver.