Hi Mate
I also made an account a few days ago, after winning the bet then I made a withdrawal and they said the same thing "multi account"
I answered the e-mail and said that I never made more than one account and asked them to provide proof
A few hours later they processed my withdrawal.
So in conclusion they will freeze all new accounts, but if you can prove that you don't have more than one account then the withdrawal will be processed.
https://imgur.com/X2KnSjtThey might be having this mentioned in their terms, but this is completely an unfair rule. Once after winning it is their money and here the fortunejack team should not try to control it. When the user tends to withdraw it needs to be processed. Requesting to prove that you don't have any other account is simply annoying. No gambling sites should do this, if their policy is to have one account the users should be requested to prove it prior to the betting.
This rule applies since they offer new promotions, yes it is true that this new promotion is vulnerable to cheating by users
If you are honest then don't have to worry about playing normally, everything will go accordingly.