Dont ask how, but my Cost of operation is literally $0.00.
Someone else will probably be paying for this. Nothing is really free.
Could mining be a good use of my time if my electric bill is non-existent?
Maybe. I don't think there is any downside other than maybe ruining your hardware. Back in 2017, this
user claimed that you can make from $1.5 to $3 dollars a day depending on what you mine. The numbers are obviously not the same as the difficulty rate is always changing. But if it's "free", and if you don't care about damaging your GPU, then why not?