A user in Shuffle's topic posted that the root of the problem for such issues when the casino asks you for your "other accounts" was probably because there more than one user in the same household/using the same I.P. Address. That probably turned on a sort of "alarm" in their system, telling them that users are playing with more than one accounts.
Although the resolution will be a case to case basis, depending on those accounts' playing patterns. But it is also possible that one person is playing under different accounts using his/her wife's/husband's/sister's/brother's information.
So what is the solution to this ? I mean there are instances where more than one person in a house can play at the same gambling site using the same internet connection. Yes, the KYC will be different for each person and also there will be different device used by everyone. I mean its very rare that a person A login and plays from his and other person mobile too but still it can happen. I don't know how will the casino be convinced that the person is different and not same

The solution, if you ask me, is for the user to TELL the admins of the casino that there are other people in the same household playing in the same casino, using the same I.P. address, and they're free to check the log in times of those accounts to check if they're trying to exploit the casino.
People should be more patient and not be too aggressive in calling a casino a "scam" because the service found an issue that probably could be something illegal in some instances. Because there is some probability that a user could be using the information/identification/documents of his/her relatives. The casinos are merely protecting their service, NOT to scam people.
Well if there is I guess this is the best approach he can do so that the investigation team would figure out something and possible fix the issue.
Since if he will not cooperate I guess this investigation will take long.
Although its really unfortunate to experience this situation I guess there's nothing else to do and they really need to extend their patience. Since if they believe that there's nothing wrong with them and Rollbit made a mistake towards that situation then for sure that their issue will be solve by their team soon.