I'd assume that the drivers keep a bunch of photos of actual vomit on their phones, and then just use them when they decide to commit a bit of vomit fraud? If

I'd assume that the drivers keep a bunch of photos of actual vomit on their phones, and then just use them when they decide to commit a bit of vomit fraud? If that's the case, then Uber should at least save the submitted photos and implement some minor automated procedures to raise the bar from effectively zero to just a few millimeters above. Check the EXIF data and compare it to the ride data, and compare the photos to old ones. When a vomit charge is disputed, Uber employees could compare the submitted photos to old ones in case a driver took a bunch of different photos from different angles. Or if they want to put more effort into things, control the camera directly from the Uber driver app and only allow photos taken from the app to be submitted. It wouldn't solve the problem, but Uber could at least put a minor speed bump in front of would-be fraudsters.