Germany has photo-radar, but can only issue a ticket to the driver.
Possibly that’s related to some of their history, I’m not sure.
Though they do issue voluntary “caution” money tickets to the owner at a discount to make it go away without identifying the driver.
What if you car is being toed by a speeding truck (or on a trailer) ?
IMO it's a silly hack. The fine should go the vehicle owner, who is responsible for pursuing recompense from the person the lent the car to (or file a theft report, or whatever).
If it's a physical ticket on the car (parking, speeding, etc), you can pay it before the rental company ever hears of it and avoid those admin fees.
As a side note, it does feel like my due process rights are being violated when I have to deal with this. You can't go in front of a judge, but rather can go argue the ticket in some local government office.