That graph is only as good as the "contribution profit" metric, which is basically a thing made up by DoorDash to make the financials look better. It is not "profitable" in any standard metric.

Look at how many things are excluded in contribution profits:

"We define Contribution Profit (Loss) as our gross profit (loss) less sales and marketing expense plus (i) depreciation and amortization expense related to cost of revenue, (ii) stock-based compensation expense included in cost of revenue and sales and marketing expenses, and (iii) allocated overhead included in cost of revenue and sales and marketing expenses. "

So basically if you don't count any indirect COGS, you don't count the RSUs you're paying the engineers and you don't count the capitalized costs of your infrastructure, you can eek out an operating profit. In my view, that's not a "profit."