No casino or gambling site will ever close down or freezes a customer account from excessive gambling because it is to their advantage since the house is only the winner in this. The only time aside which they freezes your account is when they notice something suspicious like you breaking the rules or you are signing into the account from various devices and the signee is initiating a withdrawal.they halt everything just to secure your funds.
The only thing have heard and seems logical is that casinos will send you newsletters or advice on how to over come too much loses and we all know all this too is to keep you with them having that belief of winning and nothing more.