To be fair, they often also pushed depreciation onto their (young, naive) drivers. But other than that, there is essentially no marginal cost to the delivery i

To be fair, they often also pushed depreciation onto their (young, naive) drivers. But other than that, there is essentially no marginal cost to the delivery infrastructure, you pay part of the driver cost directly (via tip), they at most take a cut to go to drivers (minimum) wages, but that's a fixed cost not % of checks.