Arranged roughly from least to most profitable, they are as follows: Scams and gambling Faucets Games Mining Affiliate programs Getting paid directly in bitcoin Disclaimer: This information should not be interpreted as an endorsement of cryptocurrency or any specific provider, service or offering. By contrast, bitcoin gambling sites are often just as legitimate as online gambling with any other kind of currency. I worked on surveys for a couple months and the earnings were modest, about 0. I participated in hundreds and hundreds of airdrops. Bounties are another way of generating buzz and interest in a project.