Example 2:
A fictitious web hosting company turned mining operation as a tax write off. It doesn't matter what the miner/mining costs are, if a company has $$$ to write off, they can do so by adding a tonne of miners to their racks and just blast away. Noone would question the purchase of miners as to the tax department or auditors, they are just more 'servers'.

While running their facility at a loss, they also earn BTC by the truck loads in undeclared wallets. It would be illegal to do so in some countries, but I have a feeling this is part of what is going on here along with legit big farms running close to the line.