Fact actually is I wouldn't like to put too much of a blame on mixers because everything that has a good side has a bad one too so you should definitely expect hackers and scammers to exploit the bad side too just like good enthusiasts will exploit the good side which is simply maintaining privacy.
Before we talk about mixers, we first have to question why bybit will allow themselves to be hacked. They can't intelligently shift the blame to mixers. They assured customers that their funds and data are safe and now recent events have proved that that is not the case, so they have no right to blame anything else other than themselves. What they should focus on is making sure something like this doesn't happen again.
My biggest concern about this bybit hack is the inconvenience it will cause to those that have huge stack of coins especially ETH because most of them will likely get their funds frozen too when the intend to move it.
Do they have a right to do that? Can they simply freeze people's accounts because they want to move out their funds from the exchange? I doubt that because that will not be right. There has to be a legitimate reason before they freeze an account. Withdrawals were working fine during the hack too.