This depends on the casino. Some banking methods have their own fees, to begin with. For example, you cannot expect to use your credit card for something and not pay the bank a premium for something.
Outside of this, some casinos charge a handling fee. We try to avoid these casinos as this is usually one of the tricks used by untrustworthy sites to ensure they pay you as little as possible. There are some exceptions, though.
For example, some casinos will ask you if you want priority shipping for a check. You will often have to pay extra for this service. The casino is not trying to scam you in situations like this.