Put yourself on their shoes, How would you profit if you we're giving .1BTC daily for users who just enters their address and click the start mining button?
Obviously it's a classic ponzi scheme with your usual too good to be true offers to lure users and pay the supposedly mining fee which will most likely just go to their pocket. You should avoid sites like this, furthermore look and see that your connection is not even https and secured.
The addresses on their site which they claim to have received the .1BTC is not even real