I don't use food delivery services so I'm not familiar with industry but from the business point of view can somebody explain me how GrubHub being 15 years old has $1.3bn of revenue but UberEats and DoorDash being much younger have $2.5bn and $1.9bn of revenue respectively.
If I spend $10 to acquire a customer worth $50 in revenue, my revenue is $50.
If I spend $150 to acquire a customer worth $100 in revenue, my revenue is $100.
In the second situation I have twice as much revenue. The fact that that revenue has been heavily subsidized and isn't profitable doesn't make it any less "revenue".