Omg! I might be in the same boat! I have just read the t&c's of one particular casino I recently joined in regards to 'bonus rules'. It states:
Your activity in our Online Casino, by itself, is not abusive, but Your activities in other online casinos in addition to our Online Casino, taken as a whole, constitute such abuse of our bonuses, promotions, policies or rules.
My story is as follows:
I signed up at one particular casino and used up all my welcome bonuses. No such luck winning there. Then on the same night I signed up to a different casino offering the same welcome deal. So I though, ok, let's see how I go at this casino. Signed up and got my welcome bonus and happily played and actually won. I played through the bonus requirements and was able to withdrawal, pending verification of my account.
Now, this is where the t&c's kick in. These 2 casinos are sisters, and you know what happens when sisters get together haha. After reading the t&c's, which I should have done prior to sign up, it looks more likely they will come back at me declining my withdrawal, close both my accounts and accuse me of 'bonus seeking'.
I now feel like a criminal haha. Not looking good for me, but will see what happens over the pending withdrawal period. Fingers crossed!