Well, until I started going to Bonaire, neither had I seen anything like it. Trust me though, with my rentals, there has always been a fob (small, round and pretty flat- similar to what people in high rise urban apartments use to swipe a wall mounted pad to enter through a door or access certain floors on an elevator) PLUS a metal key. Both items are required in order to start the truck. If you stick the key in the ignition without swiping the fob over the ignition just prior, the truck will not turnover and start. They have done something electronically that requires the fob to be swiped prior to starting the truck.
As an example, here is a photo of my fob for my condo complex. It is very similar to the fobs used by Avis and Budget on Bonaire-- in combo with the flat metal ignition key.
View attachment 492833