Can we also please remember simple finance concepts such as time value of money? A dollar today is worth more than a dollar tomorrow. So people investing $x now and saying oh but in y amount of time I will eventually turn profit are forgetting that there is cost of capital in connection with that.
It is, but to be really profitable, the question generally is: do you have access to cheap (or free) electricity? If you don't it can still be profitable, but it's a different (and riskier) game.
this. electricity is too expensive in the US to be v profitable