Hello, in my opinion, there are two problems with this situation, and neither of them is good. Many risky casinos believe that they are welcome to restrict winnings from pure deposits without using any form of bonus, and that is stated in their terms. We see that as unfair behavior, of course. However, there is no one who could restrict that from happening.
Secondly, if this is not the case, the casino should explain based on what rule or bonus you were restricted. As you can imagine, unfair rules or practices have little to do with common sense. So, lodging the complaint is the best step. As I hope you can see in the complaint detail, the casino's safety is not great, so there have been problems proven in the past.
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