Though it has an history of being hacked there are still people who thinks that was an inside job.
...
They promised to provide a detailed report of the hack to all affected users.
This report has never been released. This only fuels the speculation
that it was either an inside job or that there is at least something
that Bitfinex wants to hide from the public.
Besides, the same is true for the promised audits. Various Bitfinex employees
promised audits over the years, which never happened. The excuses for why
the audit is still outstanding were quite hilarious sometimes (e.g. they claimed
that cryptocurrency is too new for the big accountancy firms... meanwhile
other exchanges have been audited by one of the Big4).
It's better for them to tell a lie rather than revealing the truth.