One of the reason why we keep seeing gamblers abusing casinos terms of service is due to benefits like free, high bonuses and contest. If some gamblers can stay off being greedy, it will help casinos to spend time and money on something useful.
Bonuses are an essential part of casinos as marketing strategy to encourage customers on using the casino and attracting new users too. There is no explicable excuse to make it look as though it's the fault of casinos make bonuses available in their platform for their customers. Anyone caught abusing the bonuses terms deserves any consequence allotted.