That's your takeaway? It's like Walmart moving into a town and undercutting indie business prices until the indie businesses close, then raising prices.
What doordash is doing is scraping restaurants' websites for prices, taking a temporary loss, then going to the restaurants saying, "We got all these orders, it's a win for both of us!" to sell the contact, then raising prices and tacking on extra fees, making money off the restaurants and the customers