> Why are you inventing new facts to rationalize this practice? The driver being nice and wanting to contact the driver is cool at a small scale but at a large

> Why are you inventing new facts to rationalize this practice? The driver being nice and wanting to contact the driver is cool at a small scale but at a large scale with millions(?) of trips per day, that sort of casual niceness doesn't scale at all. At scale, you run into all the questions asked by the parent. You have to address the "oh shit, I need to get/give something back" issue in a more systemic, scalable way that accounts for all the ways drivers and passengers might try to screw each other. Whether the fee is the right way to make this happen, I cannot answer. But what I can say is the questions asked by the parent are the kinds of questions you absolutely have to answer when creating a feature allowing "call backs" that might get used by thousands or tens of thousands of people per day.