As you may know, there have been some issues with Tether and Bitfinex lately. For example, the spread between BTCUSD on Bitfinex exchange and Bitstamp exchange recently has hit 1000$+(see pic). This could indicate serious problems with USDT and Bitfinex (there is a connection between both on founders level)
We used Bitfinex as a major trading venue, but once spread has hit 140$+ (yesterday), we have withdrawn funds from Bitfinex and converted USDT to BTC on other exchanges.
Even in the worst case scenario, Crypto-Fund.Org customers funds are safe. Our goal is to protect your crypto savings.