They used Crypto Capital, like many other exchanges as a payment processor without contract.
$850 million got "seized" in 2018 by "authorities".
Tether is no longer 100% backed so they take out a loan of $900 million to cover it, backed by Bitfinex equity.
But Tether has been closely working with DOJ for a while now.
NY AG starts investigating Bitfinex/Tether. Bitfinex sucks in PR.
Now DOJ charged Crypto Capital people.
It also shows to what length some exchanges have to go through to get banking. That might be the saddest part.
To top it all off Bitfinex seems to be doing an IEO for $1 billion.