January 1, 2018 - BitConnect ponzi $2.6 billion

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BitConnect first released their BCC coin in an initial coin offering in November 2016. However, the January 2018 shutdown made the BitConnect coins worth almost nothing, even though the month before the announcement showed a $2.5 billion market cap for BCC. At the time, the company had claimed that investors would see a 10% return on their invested crypto each month.  John Biggaton appeared to be at the heart of this entire operation. The monetary returns being offered by Bitconnect appeared too good to be true. Source