No it's not. Claiming heat from a fridge would be like grabbing a cup of water for a minute a few times a day. The extra shit that needs to be manufactured and transported is surely not worth the effort at all.
I could imagine at some point, all our heated and cooled air, water, and ice could be one system.
For fast temperature demands, such as hot water or ice, perhaps reservoirs of chemically stored heat and cold could be built up at useful locations, for very high speed release when needed.
Completely dispense with storing hot or cold air/water, except for fridges. But provide the cool air for them, as a byproduct of being one system, avoiding the local inefficiency of both cooling air in small quantities and generating heat at the same location.
It would make it cheaper to have more fridges and ice makers around a houses, if you just had to plug them into power and an HVAC controlled "inlet/outlet".
Did you know that people do this? The brits love making a cuppa tea. It's free energy and the heat pump in the fridge is already doing the work.
That's an average power consumption of 20W. But electric heaters are say 1200W or 2000W.