One thing you should always remember is that nothing can be earned for free. People who promise to give something for free are the biggest scams. As far as I know, I have not heard of any such site till date where you can get bitcoins just by making an account. All these sites are created to trap many people who are new they don't understand anything they make an account and get there bonus asking them to make a deposit to withdraw that bonus. Later when they deposit they freeze their deposit and they are given many conditions which the customer cannot fulfill thus they fall into the trap of fraud. In my advice I would say such websites should be banned now.