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I saw an advertisement of CryptoX2 recently, and tested out the website. They promise to double deposits within 24 hours. The first time I used it, they paid me fully, and the second time worked too, but I have heard a lot of stories about similar sites being scams, so I am wondering if this is one of them, or if not, how the site works? Does it wait until the amount I deposit gets higher before not returning any money?

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This has a name: pyramid scheme.
– Basj – 2017-07-01T15:20:16.040@Basj Sounds more like a Ponzi than a Pyramid scheme to me. – CodesInChaos – 2017-07-02T08:57:52.257
@CodesInChaos when you double at each generation, I think it's definitely a pyramid scheme. – Basj – 2017-07-02T11:47:45.697
@Basj Later investments pay for the profits of early investors and it collapses once it can't sustain exponential growth anymore. In pyramid schemes you profit from the people you referred (plus their referrals, etc.). Thus the lion's share goes to a few nodes near the root. https://en.wikipedia.org/wiki/Pyramid_scheme#Relation_to_Ponzi_schemes
– CodesInChaos – 2017-07-02T12:06:10.517Time to go. The pyramid scheme got published. It's not long to live now. – Joshua – 2017-07-02T15:55:05.613