I think it makes a lot of sense for Uber Pool, at least, because shitty riders make the experience worse for other riders. The last time I took a Pool, we picked up someone who booked the ride for one person but had a friend with her. She tried to argue and say she would give the driver a tip at the end, etc., while the driver tried to explain that it doesn't work that way. Wasted about 5 to 10 minutes of my day because of that.