Few days ago someone introduced me website "cryptofree.best" and told me that you can collect Bitcoin in this website just by a few clicks on "Roll" button and by spending at least 1 hours/day. And tempted me that you can collect 1 BTC without spending any money in 3 months. But he pointed out that the rule of the above website is minimum 1 BTC for withdrawal. In that website if you invite an active user to the website then you will receive additional bitcoin as a reward/bonus.
He also tried to convince me by commenting that one of his friends had successfully cashed his money.
But how is that possible? Are they misusing our smartphone/computer graphics remotely. If not why they are paying for free?
Are all website like "cryptofree.best" a scam for mining?
(I am not sure about tags. Feel free to edit.)