Firstly I have to ask, why on earth did you keep $7.68 million dollars worth of bitcoin on any exchange? Such large amounts will attract attention and if they have any reason to suspect everything is not one hundred and ten percent legit and perfect with an audit trail they will certainly ask questions and freeze the account until they are happy. Good luck getting it unfrozen.
That is the reason why to not trust on every exchange the big volume of potential coin because that attracts everyone and think badly and be greed. Even strong security had been there when the develop has own interest on it, they will do everything. That is very bad experience because you put all your time to collect profit and then other people will get it. Hopefully, there is only wrong on the system and unblock your account.
Exactly, I agree with you. But one has to keep such amounts on exchanges for the arbitrage needs, otherwise, you won't be able to proceed with transfers between the exchanges that fast.
