That seems like the most likely case. Hauling PCs sounds like a LAN party mixed with a holiday. Would she really believe the crap they fed her about the crypto

That seems like the most likely case. Hauling PCs sounds like a LAN party mixed with a holiday. Would she really believe the crap they fed her about the crypto mining? Even if for some miraculous reason they did make that much money, there would be no incentive to tell her unless they'd also pay her electric bill just to get rid of any unwanted attention. Just add a clause limiting the free electricity to a sensible amount, and charge at-cost for anything over. I rented a cottage (not via AirBnB) for a week and paid for my 11 kWh of use over that time at the end. Of course, these professional hosts don't actually want to meet their guests…