There has been one single case- this one- that hit the media.
You need three clear pictures that are time and location stamped- so they better be immediately after you dropped off the passenger and nearby. I have had four pukers in 20 months- only three did i get reimbursed for. The first time i drove home before taking the pictures and the passenger denied it the next day. They were almost blacked out drunk.
Also if you are a driver that regularly makes claims Lyft will get suspicious- and you will get taken off the platform. I have had passengers steal everything from an IPad I had for passengers to watch movies, to sunglasses, and car chargers stolen. It is tough out there. But I average twenty five an hour after costs. So i drive on.