I think the confusion is that unlike in the Northeast, where PlatePass places EZPass transponders in the cars (in a box that you can close if you don't want to use it), in Florida PlatePass doesn't actually place a SunPass transponder in Hertz cars, but instead relies on the Florida tolling authorities' use of "toll-by-plate" technology to pass along tolls to Hertz customers. And there's no way to shut that off (although in theory having a SunPass transponder should override it). So technically it wouldn't be SunPass (the transponder company) billing PlatePass, but whatever tolling authority (Florida's Turnpike or whatever) that billed PlatePass.