Bitfinex is a fraudulent company, you like it or not. Everything is doing is illegal, starting with not having any license and ending with their shit Tether.
Like I said, there is lots to point to. Unlicensed MSB, unregistered securities (BFX tokens), unregistered derivatives (Tether), the banking blockade against them, their unwillingness to provide an audit of Tether, Phil Potter admitting he trades on the exchange against his customers, etc.
But Bitfinexed is still a wingnut.
I think he has been going at it for some time and kept being unacknowledged until now that people are starting to believe him, and took a big head. Still, if you put aside his spammy retweets, his analysis are pretty well documented and made a lot of folks looking at them with more scrutiny, which is a good thing.
I used to use them, they have a nice interface and good trading platform in general, but I would be careful if you want to leave funds on there just in case they get hacked again and decide to make their users pay like last time.