Don't rely on that T&C because a scam casino can simply change the rules when you win big , but yes we can always take charge of knowing the rules because this can be use against us lol.
T&C is vital when you want to play safely to a casino since its the rules that needs to be follow. There's no way a legit a casino will modify there T&C when player won big amount since it might cause it might ruined there license.
You should avoid shady casino at the first place and stop ticking that agree box during registration period for acknowledgement notice.