I don't buy it for a second that restaurants don't know they are losing money. Just sounds like some made up bullshit because you have an axe to grind with Doordash.
You just claimed that hundreds of thousands of business owners don't know how to run their businesses, but that you know better. In general the idea that there is a one sided transaction being freely entered into is almost always a conspiracy theory riven by dislike of one side in the transaction.
