Experienced that as well. I had one ride where three drivers in a row cancelled. One of them pulled up and as soon as I reached the passenger door he just drove away leaving me flabbergasted.

But the app automatically scheduled a fourth driver and he was excellent. Spoke to him about it and he said it was rush hour and drivers would get a chance at a more lucrative client and they'd drop you and quickly take it. He told me I can't just treat people like that even if it means I make less money.