even how hard or strict a exchange is but if there is corruption on going surely cases like this will continues to happen.
This is same reason that it is really hard to trust sites that asks KYC because it will always be the target of criminals.
People from some countries are not allowed to use decentralised non-regulated exchanges. Most of them are forced to use exchanges regulated by law, take the example of China or USA. Even major exchanges set in their TOS to not accept registrants from those countries for legal issues.
The point here is not to use centralised exchanges at all, especially as they are rgulated, but to not use those exchanges for big money long term holds. Always remember the rule 'Not your keys, Not your coins'