500k+ downloads and no one knows about it? Wouldn't be surprised if all those downloads were botted to increase the numbers. I wouldn't even bother going to the link and check whats in there. I wouldn't say it is impossible to mine if you are talking about some other altcoins. But if it is bitcoin, then LOL. Impossible to mine even a single coin. Not only will you be wasting your time, you will also be damaging your phone.