Yes, very convenient rules when they have only one month time to contact him with their information 
But he didn't have to send mass-email to everyone, only to people with positive balance in accounts, and he claims this is not a lot of money/people.

Regarding the suggestion to send an email to users, this is clearly the most effective way to resolve this issue. However, as we mentioned in our initial statement, we do not have access to the database. We do have a limited version of the database that is shared with regulators for compliance purposes. If we had access to the actual site database, we would simply restore the site and allow users to withdraw their funds directly. Unfortunately, this is not the case, and we can only do what we can with the resources available to us.