Bitfinex owner owns Tether also. The assumption is that all tether is backed by US dollars, if Tether can't prove that is backed 100% with the amount of USD then Tether will crash, but not to 0. It will crash like bitconnect. Most of the people don't see the obvious tough, even if tether crashes , it has only a market cap of 2 billion dollars. The total marketcap is around 500 billion, so I don't see what's the big FUD about. In that case it just means -2 billion dollars from the total market. People are easy scared and people and institutions that want to create FUD know that. They want to ride the train and want to buy the coins cheaper after the scared people sell so they have more control on the market manipulation.