The behavior depends on the intentions of the casino, influencers only receive instructions from the casino. If an influencer is deceiving his followers with fabricated reviews maybe the brand or casino, he's working for is comfortable with him, the influencer, posting fake reviews. Although most people do this because sharing unrealistic bonuses can fetch people to play games with the casino. And the type of deal they've got with the casino also determines the action the influencer exhibits. If he's paid based on the number of people that plays through his link, then he would do anything to attract his followers to gamble with the casino. But, if the casino is paying for advertising on the person's page, I don't think the influencer would do something else other than the instructions of the casino.