These are not get-rich-quick opportunities. You will need to work but the potential is there. As an example, the second one on our list is freelance writing. If you're a good writer, you can hit the ground running and earn hundreds of dollars to write once you find the right clients. If you're not a good writer, you may get paid less as you get better and find more clients. The potential is there but so is the work.
These little jobs are done by people who log on to a company’s site and choose tasks, which could be as simple as clicking a link. Amazon's Mechanical Turk is one of the most well-known sites of this type. Also, there are crowdsourcing projects, which are similar to data entry, where companies engage an army of virtual workers to each do one small part of a larger project.