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
I think I've stated this here before, every casino should copy from what stake did when they updated their terms and conditions, they lock all their users out of their accounts, that is, you can login to your account by-pass the accept new terms and condition pop up which cover the whole screen, that is, stake forced all their users to make sure to read and accept the new terms before they are allowed access into their account proper, this is the best strategy, much better than sending emails, with this strategy, even though I personally believe that many gamblers are still going to accept the updated terms and conditions without reading it, I still believe this is much better than sending emails which users might not even take notice off, or will allow to sit there for several days or weeks without opening it, and some have trashing system which trashes mails in the inbox that have not been read for a set period of time.