[randomdata]

The difference is the opportunity cost. It's easy to see what other opportunities labour has, it's not easy to see what other opportunities copying bits has, especially in the household capacity. I certainly don't see anyone asking to use my residential bit-copying facilities in any meaningful capacity, but I do see people asking to use my time.

[CaptSpify]

Additionally: I don't really have an "unused" amount of hours at the end of the day. I definitely have an "unused" amount of bit-copying capacity.

[SixSigma]

Your download server could be mining bitcoin and all those data centres are not free either.

[randomdata]

Is the commodity hardware that people watch Netflix on really going to generate any money mining bitcoins? Or are they just going to rack up an expensive electricity bill?