Cars don't just "stop working" with no residual value, so this isn't how it works. They start to require very expensive repairs and maintenance and it gets tough to determine what you should get done. And why would you give a family member a car that's giving you problems and not good enough for you? "Here, take this EV that's likely to require repairs costing 10x the value of the car."

If the cost of repairs is more than the benefit of you having this car, it's worth zero to you and you should scrap it, sell it for $1 or gift it to someone who has more favorable math than you regarding repairs.

That's what I meant by stops working - stops working for you.

No longer operational meant broken and not worth repairing.