Aggregator
An aggregator is a marketplace that lists many restaurants, owns the customer relationship and charges commission on every order. Just Eat, Uber Eats and Deliveroo are the three in the UK. Their genuine value is discovery, and it is real: they put you in front of people who have never heard of you, at a scale no single shop can buy. The trade is that the customer is theirs, not yours.
In practice
Just Eat, Uber Eats and Deliveroo are aggregators: they gather demand, present a choice of shops, and take a percentage for the introduction. Their genuine value is discovery, and it is real — they put you in front of people who have never heard of you, at a scale no single shop can buy.
The trade is that the customer is theirs. You do not get the name, the address, the order history or permission to contact them, so you cannot tell a regular from a first-timer and you pay the same rate for both.
Treating it as a choice between the apps and your own platform is the mistake. The sensible shape is both: the listing for reach, your own site for the people who already know you, with a reason to switch that only exists on your own site.
Also called: delivery marketplace, food delivery app.