For me since it is a gambling I don't have to blame anybody because everybody is aware that gambling make up of different things both higher risk and the lower risk, because who ever that is going for gambling knows that it deals with lost and profit even though someone defraud you it's as same thing as gambling, so nobody should be blame
Gambling is different from cheating, scamming, exploiting, and fraud. Obviously, the ones at fault here are those cheaters and exploiters. Casino or gambling operators often give bonuses to attract players, since the gambling industry is a business, they tend to compete with other gambling operators thus they are giving away promotions and bonuses with certain requirements. It is the fault of the cheaters and exploiters to cheat the casino operator so being neutral when we really know who the cheater and exploiter are the same as allowing them to just do whatever bad intention they have on any gambling platform.
In reality gambling companies don't get any benefit from people abusing the system and in fact pay large amounts for teams that seek to stamp it out. The sort of people who go to great lengths to take advantage and abuse the system of bonuses tend to stray into many grey areas, which then lead further on to pure criminal activity. These sort of cheaters will often go to extreme lengths if they perceive the ability to squeeze free money out of a company and we must remember that a single dollar has a very different value in different countries. If somebody is able to make say $300 dollars by jumping through numerous, but repeatable, hoops.. then they could potentially live an above average life in somewhere like Venezuela.
Indeed, gambling platforms being exploited by cheaters often lose a huge amount of money. Since these cheaters and exploiters' main goal is to make their pocket fat at the cost of the gambling operators.