Yes it’s true. Basically DoorDash creates a fake website for the restaurant and even sets up a phone line to take orders. The order is then forwarded to the actually restaurant who aren’t aware that this order is done through DoorDash. If there are any issues i.e. wrong order forwarded, too busy for phone orders so long prep time, or out of a particular menu item, the restaurant gets the blame and the customer has no idea that they didn’t order with the restaurant directly but rather through a middle man. This has little upside for the restaurant and plenty of downsides.

DoorDash also sets prices independently of the restaurant menu. In some cases this means DD prices are higher than the store, in others DD prices it lower than the restaurant, and takes a loss in hopes of gaining market share.

This results in fun opportunities like Pizza Arbitrage https://www.readmargins.com/p/doordash-and-pizza-arbitrage

That's amazing. didn't they do that in Silicon Valley show ? didn't think it was real

Yes. In these cases, which aren't all - DoorDash does have contracts with many businesses - DoorDash is acting as a reseller, purchasing food at retail and selling it on to the customer for profit, at least when they get the prices right - www.bbc.com/news/technology-52724062