Ah ok, I think we do have a mix of leasing companies and offers where i'm from. But what you describe sounds like a bit what I am after.
Basically my take is that if a company can make revenue on a product on a monthly basis and keep doing so its in their interest to keep the product alive.
Its a bit like iPhones, Apple are making more and more money from services that's consumed on the devices, that's why we are getting fairly long (not long enough) support on them with updates and so on.
Another idea is a forced subscription model if you buy a car that goes to the manufacturer so that they can provide updates to the car. That goes for both HW and SW.
A good example is that cars that now only have 2G and 3G modems then would be offered an update to 4G or 5G. Currently we might have a heaps of cars not passing MOT due to that they on-call service isn't working when the 2G and 3G network is being shut down.
Here in the US, financing is typically handled by the financing division of the auto manufacturer.
For the subscription model, companies tried that, and got shut down, like BMW charging a fee to use CarPlay. People don't like knowing the features are already included but have to pay extra monthly to use them...
It is easy enough for Tesla and other EV manufacturers to put features behind subscriptions. Tesla does that with their FSD. You can buy a lifetime subscription (for that vehicle) or pay $200 per month for the subscription. Putting perceived value to the side, they are doing it today.
Tesla (and I'm sure newer EV companies will) offers retrofit kits for their vehicles. You can upgrade your autopilot computer and add cameras (if you have the older Tesla). I have added the power lift trunk to my Model 3, CCS compatibility to my Model 3, Biodefense Hepa filter to my Model Y. I have also upgraded components to newer redesigned parts like the driver's side wiper arm on the Model 3, revised side repeater cameras, and added SiriusXM to my Model Y.
Since Tesla uses individual computers for their components, I can see them offering upgrades from 4G to 5G once 4G is no longer available. For a fee...