buying or holding a bitcoin is also a investment and also it has a risk because you spend and risk money just to make some profit and try if your money will grow . you should think twice before investing your money .
I think all investing is risky, but the good thing with bitcoins is that the price fluctuates that much and we have reach the peak of $1,000 and with that amount we can still achieve so it is good to buy now and hold it in the future.
Investing in bitcoin is not risky but investing in online sites is really risky for sure, as we can never know how genuine or legit site it is as there is no face to face agreement is involved, so it becomes difficult to trust anyone online.
everybody can earn extra revenue with little to no risk and frequent payouts. Bitcoin investment sites usually are involved in professional forex, commodity and cryptocurrency trading allowing users to get a return on their investments based on the companies own returns from the trades.