We searched about it on forums and found out some sites decide to ban players when they win.
Now the support is saying that my account got frozen because of multi accounting.
Was it illegal to open two accounts between me and my husband?
Stake will not ban you if you win since there’s a lot of users that betting huge amount and win without any problem. As explained already by many users above, You clearly violated the ToS for Multiple account. You should declare all the account connected to yours including your friend, wife and others that open using the same IP. You should be careful on sharing IP to a friend since most online casino have strict multiple account rules due to their bonuses and other promotion.
I will provide all the documents required but I would like to know first if what we did was prohibited or not.
I think you should move your case to 3rd party arbitrator like AG and CG since you need someone to verify your documents. But I really doubt case like this can be solved by providing documents since the ToS clearly stated what will be the possible repercussion on doing it.