The CEO has been quoted as sympathetic towards a known ponzi scheme after it vanished with everyone's deposits.
https://steemit.com/bitfinex/@gaitan/bitfinex-ceo-suspected-...
Raphaelle Nicole, the CEO of Bitfinex invested in the past years in a number of ponzi schemes and also supported Trendon Shavers, who was found guilty recently for "a classic ponzi scheme" and was sentenced to 18 months in prison. In 2012, Raphaelle tried his own ponzi scheme: “When I need more coins than I have to fill an order, I will ask everyone that previously “registered” with me to lend me some btc. After 7 days, I will return all of it, principal + 2% interests [per week]…. Now the questions you might have: What could you do to make so much profit? Let just say that I do “arbitrage”: I buy low and sell high.”
Here is the summary of Tether:
https://www.reddit.com/r/btc/comments/6xpddt/as_20m_more_tet...
https://medium.com/@bitfinexed/latest
https://twitter.com/Bitfinexed
https://www.reddit.com/r/btc/comments/7059hr/more_25_million...