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FAUCET (free) Bitcoin faucets are a reward system, in the form of a website or app, that dispenses rewards in the form of a satoshi, which is a hundredth of a millionth BTC, for visitors to claim in exchange for completing a captcha or task as described by the website. There are also faucets that dispense alternative cryptocurrencies.Bitcoin faucets are a reward system, in the form of a website or app, that dispenses rewards in the form of a satoshi, which is a hundredth of a millionth BTC, for visitors to claim in exchange for completing a captcha or task as described by the website. There are also faucets that dispense alternative cryptocurrencies.

PONZI (not free) A Ponzi scheme (also a Ponzi game or a Ponzi) is a fraudulent investment operation where the operator, an individual or organization, pays returns to its investors from new capital paid to the operators by new investors, rather than from profit earned through legitimate sources. Operators of Ponzi schemes usually entice new investors by offering higher returns than other investments, in the form of short-term returns that are either abnormally high or unusually consistent.

Ponzi schemes occasionally begin as legitimate businesses, until the business fails to achieve the returns expected. The business becomes a Ponzi scheme if it then continues under fraudulent terms. Whatever the initial situation, the perpetuation of the high returns requires an ever-increasing flow of money from new investors to sustain the scheme.

The scheme is named after Charles Ponzi, who became notorious for using the technique in 1920. The idea, present in novels (for example, Charles Dickens' 1844 novel Martin Chuzzlewit and 1857 novel Little Dorrit each described such a scheme), was actually performed in real life by Ponzi who with his operation took in so much money that it was the first to become known throughout the United States. Ponzi's original scheme was based on the arbitrage of international reply coupons for postage stamps; however, he soon diverted investors' money to make payments to earlier investors and himself.

SOURCE WIKIPEDIA