Investing in bitcoin is much more risky than bank investment cause in bank your investment will gain a small interest in the terms of per annum of your investment it is not risky but you see the profit is to small, but in bitcoin you will earn unlimited income even they have more risky to invest here cause the value is unstable this is the risks and challenge to encounter your patience , but bitcoin is unpredictable you don't know when it getting up it's surprise you.