I think the only way though which one can get free bitcoin are from signature campaign, although in one sense we can say that it is not a free earning of bitcoin as you have to world for it and use your energy but in sense you are not investing your own money that is why we call it as free earning of bitcoin. i remember i did not want to waste my time on these faucets, but 2 years later each entered captcha would bring me $10 per day