FSD makes sense as a subscription as it's something that gets updated all of the time. Subscriptions to things built into the car like heated seats seems like a way to scam money out of people.
I agree; but Autopilot unlike FSD hasn't been updated in several years.
It doesn't contain maps or context of the roads, it is just Auto-Steer + Lane-Change + Full-Range Cruise Control under one brand-umbrella. Mostly useful on the Motorways/Freeways, and commonly found in competitor's vehicles.
It was at some points; I believed it was priced between $2K-4K depending on the point in time and either offered post-purchased or only during ordering, again, depending on which time-period.
My Garmin receives updates and I don't have to pay a subscription for that. Hell I don't even need updates if it does what it should. Often the updates are there to fix bugs because the software was sold before being ready.