That used to be the case 15+ years ago, but is not true now.

What's that extra m for?

Ours is OohAahFhqwhgads

Even better, they paid $2.89 tax on $35 of the total

Agreed, and it's because they don't serve drinks with ice - I witnessed this pretty much everywhere from Amsterdam to Finland. I asked one person why and was told no one wants their expensive drinks to get watered down. At the time, a fountain drink was at least double the expected price in the states. No ice, no need for a straw?

I just wish the fees weren't based on a percentage of the total bill, on top of the fact they blatantly jack the menu prices up. A few of us would like to use DD and similar for work lunch, sometimes. The charges for $60-80 of food is ridiculous, when it should be a flat rate for the service. You'd think they would want to incentivize these larger orders. Assuming the food is ready when the driver arrives, there should be no difference for the driver, who would generally get tipped on top.