What is the 'argument of TANSTAAFL' here? It just means there are hidden costs to things that appear free. From that coal video, when the coal companies gave

What is the 'argument of TANSTAAFL' here? It just means there are hidden costs to things that appear free. From that coal video, when the coal companies gave the miners the clothes and gear for 'free', but there were all the hidden costs- that would be an example of TANSTAAFL, but it's not being used as an argument.