A subculture trades in cars every 3 years, as in they are resold on the used market for another 13 years.
The rental companies typically buy vehicles from the manufacturer at such a volume discount, that they're able to flip them onto the used market a few years later and come out even with taxes benefits factored in.
Mid tier Android makers that couldn't secure chipset support beyond 3 years began to realize they have to exit the market a couple years ago, a guaranteed outcome of Apple fixing their story long enough for resale values to impact purchase decisions.