Lyft should treat this as an emergency
Lyft makes it nearly impossible to report a driver using another driver's Lyft account.
I couldn't report it because I didn't get in the car with the man who was using a woman's Lyft account. Lyft only gives the option to make a complaint about someone you've ridden with.
Not everyone remembers to check that the person picking you up is the one in the photo. They need a way to report a driver that doesn't match the account, instead of cancelling the ride, to prevent that person from continuing to pick up people. It should be able to be flagged immediately!
The only option I had was to cancel the ride and be charged $5.