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RE: EDIT: Potential Ponzi! - SierraHash offering free 150 GH/s BTC mining
No catch. You won't earn much from 150 GH/s , but probably around 3-4k satoshis a day.
The company benefits because you'll use their product and might buy more power from them and some people will reinvest the earned BTC to increase power and BTC earnings.
The other way is to sign up and withdraw 100k satoshis each month or so for free. Just added bit of BTC to scoop up in my opinion