In my point of view, if you want a free bitcoin go participate in airdrops, there is a lot of airdrops out there but the coins in airdrop some are worth it and some are valueless just choice a good project before you join. As I read in this forum, they say that some free bitcoin takes too long to claim it, and there is also a hacker and scam there. If I were you just joined in a legit ICO campaigns you must work hard to earn money, because you can not earn it easily.