Let's be real. A staggering amount of drivers are incapable to switch on Automatic Cruise Control or trigger automatic parking. They know how to start the car, how to switch lights and wipers on/off and that's about it.
Paying subscription for something what they are never going to use is going to be a hard sell.
Probably a big chunk of these tried ACC a few times, found that ACC sucks unless you're on perfectly clean empty highway, and said "screw it I'll drive it myself".
I have auto parking and never use it, it came with the advanced parking sensors that I do use heavily. I forget how to use auto cruise because I drive outside of the city so rarely, it takes me awhile to “trust it” again when I do some highway driving.
And to be even more real, a staggering amount of drivers won't be able to afford an autonomous driving subscription even if they wanted to. Or a car new enough or in good enough condition to have functional self driving.