There's so much to unpack here. They initially say user funds were not affected and then went on to say the incident affected 9 user accounts. They haven't mentioned a hack yet which will normally affect their hots or cold wallet generally, so it's possible that this was initiated internally by a staff.
It baffles me how 9 individuals could hold $14 million in crypto on a centralized exchange, that's an average of $1.5 million held my each and is not an amount you want to leave out of your custody.
There is basically two factors that is responsible for this user accounts hacks the one that is mostly suspected to be responsible for this us the insiders stunts in this hack incident, the other being possibly traced to the users themselves.
For the fact that 9 accounts holding such amount in a centralized custody makes them a special target of any kind, any way, we be looking out foe more details on this the case.
This is a special case as no hot wallet was mentioned to have been compromised.