Does anyone know which pool GM uses? and their total hash rate?
Based on the number of people I have seen buying their contracts, they would easily save tens of thousands of $ a month by running their own pool (even assuming pool fee at 1%). I would estimate their total hashrate at 50 PH+ if they are actually mining equivalent to the amount of contracts that they sell.
How did you estimate their number of contracts?
Anyway most (if not all) of their mining contracts are not profitable, so they can afford not to mine at all and just work as a crypto-casino.
50 PH is my estimate seeing the number of times I have seen people put in large amounts of money with them. If they do not actually mine, it's worse than a casino - in a casino the user atleast has a chance to win, this is like a guaranteed loss.
There is a word for that - ponzi.
Having said that, even though the contracts are unprofitable they could still be mining. Their maintenance fee is what kills it for the customer, but if GM has actual hardware and decent electric rate they could be mining with no risk for themselves because the hardware is paid for by said customer and they make guaranteed profit via those exorbitant fees.
For example:
1) Ponzi - GM takes 1 BTC and pays back pennies each day. BTC diff rises, contracts become unprofitable after they've paid out e.g. 0.7 BTC so they pocket the 0.3 BTC. But if a miracle happens and diff drops they would have to fold the tent or come up with some excuse to avoid paying out more than 1 BTC.
2) Mining - GM takes 1 BTC, buys hardware, and each day pays out ~50% or less of mining revenue, spends ~25% on their electric bill and other expenses, and pockets the remaining ~25%. BTC diff rises, contracts become unprofitable, they've made their profit regardless albeit likely less than a ponzi. They can even continue mining with the customer-sponsored hardware after customers have been relieved of their contracts. But if a miracle happens and diff drops they still keep making money unlike a ponzi.
It's obvious they don't give a shit about false advertising and other business ethics but running a blatant ponzi is not just unethical, it's a crime in most jurisdictions. They might be running at least some fractional mining. But it's still an awfully shitty "investment".