Because he's Elon Musk and you're not

 "A good place to start would be helping consumers understand what automotive tech can and cannot do. Today’s “advanced driving-assistance systems” include functionality like lane-keep assistance (keeping a car between the lines on the road) and automatic emergency braking that reduces the need for driver engagement in certain road conditions. Often seen as a step toward fully autonomous vehicles, ADAS nevertheless requires drivers to keep their eyes on the road and be ready to turn the steering wheel or apply the brakes if a problem arises.

That kind of vigilance doesn’t jibe with a term like “Autopilot,” which suggests a vehicle that can operate independently. Indeed, European regulators bluntly concluded that “Tesla’s system name Autopilot is inappropriate as it suggests full automation.” Musk disagrees; he recently called the idea of changing it “idiotic.” As misleading as “Autopilot” may be, the term “Full Self-Driving” seems even worse. “The real name should be anything but that,” said Duke engineering professor Missy Cummings, who has studied autonomous technologies extensively."

https://slate.com/technology/2020/12/tesla-biden-self-driving-cars-regulation.html