What do you mean, "why should the customer care"? If I'm being told that what I'm paying is a tip, I expect it to go to the server. I expect the administration fee to cover administration, I expect delivery to cover deliver, and I expect the tip to go to the driver, not to be taken by management whenever profits are down or their pricing model fails. But since companies can't be trusted to be honest with the consumer about what I'm paying for (even when spelled out with line items), I only ever tip cash when my food arrives.