To the best of my knowledge, every organisation or promoter has its own strategy for marketing, and maybe they might deem this aspect of promotion very important because people would be interested in it to make a good profit, hence they coming up with this promo.
This is very true , each casino takes its way of acting according to what they are looking for, if the marketing manager considers that this is appropriate then that is how it should be, it may be that the traffic is high on the site and they can afford to put in this type of Competition , which means that the casino is doing well, so we have to See it from a positive point of View , sometimes we misinterpret things, it is a casino that has done Well.