Consumers largely dispose of waste through municipal pickup which is already well overlooked. Setting up oversight for industrial disposal by a bazillion corporate entities in this theoretical shareconomy of appliances would be an enormous burden on the already undercapable county and state EPA offices. It would probably all just get shipped out of the country anyway.

If you think modern refrigerators are wasteful I'd ask you to prove it. The design choices they make are manufacturing trade offs—not simply cutting corners to make it break. A refrigerator might only last 10 years, but its a net gain if it cost 1/10 the energy to build, uses 50% of the power, never leaks refrigerant and uses a small ammount.