Companies run marketing programs for getting positive effects and growing up their business more including income and profit. It does not make sense to run any marketing programs while knowing it is best way of burning money. To reduce risk of money wasting and burning by lack of experience, companies must be careful by referencing terms of marketing programs run by other companies as well as how to detect and disallow cheaters.
Having clear and well defined terms against cheaters will help them avoiding mistakes and so maximizing effects from marketing without damage on their company fund that can be used for many purposes, not only for marketing.
A campaign running for one company may not produce similar results to another company too. Just like a signature campaign for one casino may not work the same way for another casino. The reason is that every company has a different budget and a different approach. Some may allocate more budget and focus more on quality, while others may think of spending less budget, and some may prefer quantity over quality.
That is the reason that casinos should not copy others' campaigns and analyze themselves as how they can make their campaign more effective or maybe some startups need to develop trust first and marketing may not be suitable at that initial stages.
All depends on the length also what additional campaigns or promotions they do.
Since if they only bet on signature campaign and nothing else follow up since the casino don't have budget to spend for other things then provably that they won't get those result that they want.
But if they have deep pocket and willing to spend on those things that can make people feel attracted to avail those promotions or maybe giveaways they can offer then maybe they can lure people to come and test their casino.