I suspect that they believe they will lose less money by doing this than they will lose from fraudsters if they don't do it. DoorDash is the epitome of the low

I suspect that they believe they will lose less money by doing this than they will lose from fraudsters if they don't do it. DoorDash is the epitome of the low-margin business. They are almost certainly losing money on a huge fraction of their orders. Losing out on your business hurts them somewhat, probably, but not nearly as much as it would hurt them if they had to foot the bill for a few fraudulent orders. Your order maybe represents $1 of profit for them. If it was a big order, maybe $3. A single bad order could cost them $50 or $100 easily