Manufacturer must support the product for 10 years after the last sale. In the case that they go belly up, that I don't have experience with, but it's likely that another company would step in to fill the role. Support can be quite lucrative.

Well now, this isn't quite the same thing as your normal IoT device. You would need to be Really Damn Sure any updates are bug-free before you could push them, which would take actual financial resources. Open source would help here, but not quite as much as it normally would.