I think most customers that don't care about it are simple lacking the information to correctly assess the impact of it. I think accurately explaining a few of the possible downsides:
- If your internet if not functioning, the device may or may not function
- If the company that sold it to you closes, it may immediately stop functioning
- If the company that sold it to you decides to discontinue the product, it may stop functioning
- The company that sold it to you may remove or break functionality at any time. It may be left in this state for many reasons.
And then pointing to concrete examples of products where each of these cases happened, which shouldn't be that hard to do, and how long it took to happen in each case (from initial product launch and from last device sold), would result in a lot of people caring about exactly this problem.
In other words, I don't think it's that people don't care, it's that they don't know enough to know they care. It's a relatively new development, compared to items like cars, fridges and dishwashers, which is probably how a lot of people think about their appliance devices.