Usually the best idea is to first check their KYC Terms of Service before even depositing that least amount a user should deposit in that site because whenever amount is being credit to the casino their story's changes, and even if you try submitting kyc they have no option to be toiling with your details rejecting it and giving you more excuse in the of trying to pass kyc.
So my advise and take on this matter is not to involved any funds first rather passing their kyc's before making deposit.
Terms of Service mean nothing. They're always written in a way that benefits the business rather then its customers and almost always you'll see a clause that those terms can be changed. In terms of KYC - terms of service would usually have some vague disclosure saying that KYC checks are or may be required but without stating any specific details. So you want get much from reading those.
And that's not to mention that a lot of casinos are either unregulated or operate in exotic jurisdictions so you won't have any option to sue them even if they break their own terms.