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Generally you don't rent a specific model, you rent a "So-and-so or similar". And undoubtedly the rental agreement specifically gives them permission to make substitutions. It's unlikely this scenario has not been fully mitigated by corporate legal and risk management.

As Jerry Seinfeld once said:

They know how to take the reservation. They just don't know how to hold the reservation.

It's been a while since I've rented, but I assume this is covered in the agreement when you make a booking. I'd guess their butts are covered from the fraud perspective. Maybe misleading advertisement though?