Changing of terms and conditions without notifying the users or gamblers is normal with online gambling websites? Then when you did something wrong or about to withdraw your money they will tell you that you don't read their terms and conditions, and you start arguing with them until you decide to read the ToS again and you find out that it's different.
If a gambling site changes its terms and conditions, it must notify the customer via email. sites that are reportable and trustworthy must do this. And if they don't do this and any user has problem because of it then the gambling site will be responsible. But we have to be careful about it and when they ask to agree on any condition, we have to read those reasons carefully. In that case there will be less chance of problems