Most scam Casino out their main earning is from scamming users from their huge deposit or winning using their ToS as a right to confiscate users funds. And most gamblers falls victim to this as a result of always not making it necessary to read the ToS, only very few gambles will boldly say they fine out the time to actually read through Casino rules.
I haven't been a victim to such scam but I have come across friends which have, and in some situation it happens that the ToS are being changed or amended just either some days to when they got a target victim, or when they have already freeze someone's account, then they can Edit the ToS since it might not be easily identified as edited.