Yeah for connected features, there are those costs. A vehicle we own would let me remote start it and lock and unlock doors from the app...if I paid $15/month. It's not worth it to me, so I've never paid for that service, and the vehicle works fine without it. I mostly even forget it exists. I might be more interested if it would report things like fuel level, oil and fuel filter replacement time, and so on, but it doesn't (but even then I'm not sure it'd be worth $15/month).
A subscription for heated seats, though? No. I don't want a subscription service for something that doesn't have an ongoing cost to the manufacturer. For us in particular, we buy our cars with the intention of keeping them a long time, and I'm not paying that fee for the life of the car. I like cars that are paid off.
If I'm on a heated seat subscription and they break for some reason, who pays for them to be fixed?
Comparison on the heated seats repair question: I rent the water softener at my house for $29/month. (The previous owner set it up, and I haven't gotten around to replacing it...it's a "it's working, and I have bigger issues" situation.) At this point I've paid for two of the highest-end home water softeners available, and I haven't had a single issue with the one I have, so it's definitely not the best setup financially. But, if my water softener dies today, I can call them, and they'll come right out and fix it or replace it, no charge. So there is a benefit to that monthly subscription price; they take the risk of it failing, not me.
My "dream" car is a V6 Accord from the last year they made them, which I think is 2016. I'd buy one of those right now and just keep repairing it, and hope no one t-bones me. Unfortunately I think my wife is still in the mindset of "we should buy a new car and keep it forever", which used to be my mindset, too. But she's not seeing the news on this stuff like I am, either. I suspect if I explained "heated seat subscription" to her (a feature she will not buy a car without) she would object strenuously.
But I don't like where new cars are going, at all. I don't like subscriptions, I don't like the backseat driver nanny features that blare out false alarms, and on the whole I'd rather not have adaptive cruise control (there are times when adaptive cruise is nice, but overall I prefer the old-style cruise control).
We have a 2020 Mazda that I absolutely hate driving; if that is the future of cars, I'm not interested.
I'm hoping my car and our pickup last forever. The other day we took the Mazda for an errand in poor weather because, as I said, "It's the most expendable car."