>All the hardware is built in. It works for 1500km then stops until you pay up.

Which I think is an improvement. I always used to add features to my cars that were available from the factory as an option but which I didn't order. Usually the process involved adding the hardware (spare parts, etc) and then changing flags in the car's system via OBD.

But when the hardware is already there this becomes way simpler: Just change the flags in the firmware and you're done.