- the cost of food itself
- chef and kitchen staff salaries
- waiter salary/tip
- profit margin
- rent
I'm assuming that the waiter salary/tip will cover delivery costs... so, the cost for the consumer will mostly remain the same.
The cost saving will come from the fact that if the restaurant operates just the kitchen, they don't need excellent location. A part of this saving can be claimed by the company that makes the app.
The rent difference between where you can have a restaurant vs where you can have just a kitchen in the same general area is huge in most places... so I think the business opportunity is real.
Now, the companies are competing to grab market share, and most restaurants still have the same restaurant kitchen, so we haven't seen those changes, but I think it's just a matter of time.