Well and because they actually have real self driving cars without a safety driver. Tesla doesn't have that and only has demoed it in very specific scenarios.
I own a Tesla, though I don't own FSD, but this year, Tesla has given all cars a trial of FSD on two occasions. It works remarkably well. I backed out of my driveway, then enabled FSD and it drove all the way across Portland to a friend's place with zero intervention. It was about a 15 mile, 30 minute drive.
It navigated neighborhood roads without markings and tons of cars parked on the curb. It got onto the freeway and navigated, including changing lanes to overtake slow traffic. Once I got to their place, I was able to tell it to automatically parallel park on the curb.
As far as I'm concerned, Tesla has fulfilled their promise of full self driving. The "supervised" requirement is basically just being used as a legal loophole to avoid liability if it fails.
> The "supervised" requirement is basically just being used as a legal loophole to avoid liability if it fails.
"If it fails" - so it is supervised for a reason then. It makes sense because FSD has an intervention rate in the low double digits according to community trackers like https://teslafsdtracker.com.