Because, unlike a car, a refrigerator's refrigerant system is hermetically sealed. It CANNOT leak unless its physically punctured. Refrigerators don't fail by losing refrigerant, they fail when the compressor locks up or burns out.
That is without a doubt the STUPIDEST analogy I've ever read.
And if you really see a car as equivalent to an 'appliance,' then we've really got nothing to discuss anyway.