How do you justify BMW also charging $18/month for heated seats?
Does that answer your question, or is my answer not clickbaity enough?
That is not true. In the past you have owned a car you bought. Who is going to pay for seat heating if a seat has to be replaced? Who is paying for the fuel caused by the extra weight for stuff you didn't want. What happens if you decide to modify the car you own and run the seat heating yourself?
https://youtu.be/Ag1AKIl_2GM?t=57
You can pay a recurring subscription fee to access features that they own.
I don't agree with either thing being paywalled, but I also can see nuance on things being paywalled; if there is a legit service cost to the manufacturer associated for example.