Just because a website is built, it does not mean humans will be able to find it easily. This is when search engines come in and do their job. The search engine has a spider, which gathers information from millions of sites by relevancy. The spider presents a formula and the search engine translates this through use of a certain algorithm.
Have you ever heard about make money taking surveys? As far as I am concerned, making money taking surveys is relatively good option compared to other money-making opportunities. It can be quite profitable with little effort. There is always a demand for people to take part in surveys as companies are conducting marketing research by surveys.