Though the majority of the cases usually is the gambler not really paying attention to the T&Cs, there are cases when the casino changes the terms instantly before they hand out some pretty gut-wrenching decision against a user. They'd enforce that newly-revised ToS no matter what, and get their money from the user. These accusations are not always unfounded because we have seen it happened before, though it's not too common of an occurrence because casinos that are left making the rounds in this forum are trying to protect their image.
if they do so, without prior warning, and you have snapshots of old terms. you can present it to the casino. but usually, if the site is legit and trustworthy, they send emails to their users about the changing terms.
and also, about the complaints, one should check the validity of their accusations. as mentioned above, some are due to the player's negligence about not checking the terms of the site. if you have significant amount of money to play, better browse their terms before it is too late.
