Since crypto is anonymous and indiscriminate (at least that's what they like to tell people), you can't just pinpoint a particular population and expect the same results as you would've if you did the same marketing tactic outside the crypto sphere, for the sole fact that you don't even know the statistics of such population in the crypto industry. So what some crypto casinos do is to just cast their net in the water, and hope that they get the fishes that they want. For the most part it has been very effective since one thing about gamblers, they always come back one way or another, so that initial investment of creating a general casino advertisement hoping it lands to the right people's monitors for the most part works just well enough to keep the lights on and the people paid, can't say much about its efficiency however since it involves casting your net over a theoretically large area, this may cause them to dish out huge costs.

In any case, I believe they do the same thing anyway for brick and mortar casinos, to make sure that they don't isolate every other possible player they could have within their casinos, they make generalized ads that do not cater to any specific person or population.