OK, first off, your blog post uses an entirely hypothetical, fictitious cost graph, anyone can create a fictitious graph to support their hypothesis. I highly doubt an actual cost graph on a car with actual costs would pan out the way you're looking at it. With that out of the way...
If the hardware to perform the capability is in the machine I bought, it belongs to me. I paid for it. I don't care if you discounted the price below your cost to produce, I gave you the money and you gave me the thing, its mine. No amount of legalese will change that, it is a simple fact of life. I'm paying for the gas to lug the hardware around with me everywhere I go. The hardware itself does not require software to function, you need a heating element and a switch, you can't even make the argument that you're paying for a license to the software without which the feature will not work. Even if a device does genuinely need software to work, unless the hardware can be used for other things and someone can purchase or create competing software for the thing, again, the hardware is mine and you don't get to tell me what to do with it. It's less like purchasing Windows for your computer and more like purchasing firmware for the proprietary WiFi card you just bought.
Those who want the feature can pay for the hardware. Make a car without it. If it's in my car and I didn't steal it it's mine, period. Even if they decide to put them in every car and charge me a one time fee to turn it on and even make that transferrable with the car I don't care, you can't gimp my property and sell it back to me, how is that different than ransomware? Make a car without it or charge for it for all cars it's in. It is that simple.
Off topic, we talk about e waste and what not but then we justify this form of waste by saying it reduces cost by streamlining manufacturing. This is bullshit. If it reduces costs then make it a standard feature. Why don't they? Because it doesn't reduce cost. It increases cost for every item manufactured and that cost is recouped by the subscription fee. In other words, they do it because it is profitable. And it's profitable not because it reduces cost, but because people have to pay a recurring fee to use the thing forever, and because it's valueless on the secondary market, you can't even pull one at a junkyard. If they charged a one time transferrable fee to turn it on I doubt they'd be saying it reduces cost, because it doesn't. But some people fall for this hand waving, and as a result thousands, possibly millions of cars are out there with device in them that are going for two hundred thousand mile ride right to a landfill, brand new and out of the box.