You can think of those fees as a substitute for the front-of-house: waiters, laundry, dishes and real-estate.
A restaurant typically hires twice more waiters than cooks, as equivalent (minimal) wages. Real-estate is often a third of the overall costs and most of it is the front, i.e. tables not the kitchen.
Some intermediaries are genuinely nothing but advertising and restaurants have to organise deliveries themselves. But if you include delivery costs, I’m not sure 30% isn’t cheaper than dining in.
A restaurant typically hires twice more waiters than cooks, as equivalent (minimal) wages. Real-estate is often a third of the overall costs and most of it is the front, i.e. tables not the kitchen.
Some intermediaries are genuinely nothing but advertising and restaurants have to organise deliveries themselves. But if you include delivery costs, I’m not sure 30% isn’t cheaper than dining in.