It doesnt work. And wont work. Thats why he hasnt come back when he got his first electric bill and it wasnt lower.
You cant get more energy out than youre putting in.
As it stands that is very true, however concerning everything, only the 24vdc 2000 watt Model PMG Generator $499.00 at 130% was a hoax in his statement. It doesn't add up. There is no point adding a 3kwh exhaust fan to blow air and get 3khw. Now if you have that 3kwh exhaust fan somewhere, adding the windmill fan turbine will give you some power back, in this case at least 1.5kwh but this is for another topic as this is getting something from wasted energy.
https://www.amazon.com/WINDMILL-Generator-controller-automatic-installation/dp/B01ASNP062?ref_=fsclp_pl_dp_4you'll always get back less power than your putting in. so you're just wasting energy and money. that 3000w fan is costing you money and you're collecting less than 3000w from the windmill on the other end.
cheaper to just plug the miner straight to the wall. you can't win against physics.
the only "free" energy is solar/wind. but they aren't constant, and will cost a considerable amount of money in the infrastructure upgrades to be able to capture/store. on a very long time span (>10 years) it'll even out and start to be worth it, but mining cycles don't last that long.