It's just driver being an ass or an idiot. Pretty sure the driver has an option to cancel without charging you and the one that does. I had experienced both. The first driver said his GPS isn't working and told me to cancel, which I refused because then I would be charged (also happened to me before). He cancelled, and I was still charged. I got a refund later (via customer service). The second time the driver was 10 minutes away and he called me and suggested me to cancel and get another ride. I refused because I assumed the app chose the closest driver to me. After a while he cancelled and I wasn't charged.