No restaurant can hand over a quarter to a third of an order and keep the same prices. So across the country, kitchens raise their marketplace menu prices to cover the commission. It is not greed; it is arithmetic.
Which means by the time you see a service fee at checkout, you have already paid part of that commission — quietly, in the price of the dish. Then the delivery fee lands. Then the service fee. Then the tip, which is the only part that reaches a human being who actually did something for you.
You pay the markup, then you pay the fees on top of the markup.