Then again you make it look like the DOJ just shut down BTC-e all of a sudden (after an undisclosed investigation). But this is not the case. It was total unwillingness on the exchange part to solve issues legally. That's obviously not the case with Bitfinex who are willing to vigorously and enthusiastically fight in court as the NYAG case clearly and unequivocally shows. At worst, they will pay some fines and get away with it. In fact, market manipulation accusations are not a rare thing anyway as even the largest regular exchanges have been through this before
it wasn't about "solving issues". in the view of the USA government, they were committing crimes. BTC-E openly operated as a money transmitter without license for 6 years and didn't implement proper AML/KYC controls. as a result, the feds seized their domain, servers, bank accounts, etc. in fact, the indictment was under seal (hidden from BTC-E and the public) until the seizures occurred.
bitfinex similarly operated as an unlicensed money transmitter for ~4 years until they finally prohibited americans. that's one potential charge against them. but it seems like the feds are more interested in market manipulation, which stems from activities in 2017.
i'm amazed that people think bitfinex will keep getting away scot free. the DOJ doesn't just fine people. they aren't the CFTC. their investigation is a criminal one, not a civil one.