And yet this is what Tesla did. They sold a car and added a surcharge for full self-driving as a future option, or they added it as an upgrade option. But they never delivered. That's like buying a car with the promise of wheels but the wheels are never delivered (except you actually need the wheels etc).

I'm amazed there haven't been major class-action lawsuits raised against Tesla yet, both from consumers for not delivering what is promised (full self-driving), and from shareholders for not delivering what was announced years ago (semi, new roadster). And from shareholders for artificially inflating the stock value of Tesla to use as leverage to buy Tesla and / or fund SpaceX.