Also the heat is surrounding the fridge which slowly leaks inside making it have to work harder to cool the fridge which causes it to heat up the fridge, cycling heat into and around itself
Every single house I've ever lived in or seen has had the back of the refrigerator up against a wall. Are you saying they should be free standing in the middle of the room??
Some vent down and under and some need space. You can tell the difference by the back of the fridge, if the loop is exposed then its likely the type that needs its space. If you see a cover over the rear then this would indicate an air channel.