Scam, pure and simple - tried to book a car with Europcar in the UK and these crooks simply took a £35 payment for waiver insurance I didn't request, and that wasn't mentioned at any point up until completion of the Paypal transaction. Was noted in the receipt that I'd still have the actual rental cost to pay when I picked up the car, so their carefully hidden "insurance" fee was the only "service" they'd charged for.
Avoid at all costs, this is clearly a criminal set-up