I mean, it's absurdly expensive except for all of the other types of car usage right? Companies have been pushing car subscriptions for years because they sound nice: "Don't worry about maintenance, just pick a new car every so often!". Except that it turns out to be even more expensive than just owning a car.
Leasing (unless you have some tax advantage) is typically more expensive than owning.
Ride hailing apps are great, but I don't know anyone who has run the numbers and decided it makes more sense for a daily commute than owning a car (maybe someone with no or extremely expensive parking options?).
I'm skeptical that using a self-driving car service from a profit-seeking company would end up being less expensive than owning your own self-driving car, but maybe we'll see.