There are many ways to promote and of course this is an easy way to do, especially for gambling sites that are already developing.
There is no gambling site that will actually target certain group or class in carrying out promotions, even for the age of gamblers, gambling sites cannot set limits that can be patently set.
Well, as much as I agree with everything else you said in this comment, one part I fail or refuse to agree with you is this part you said that no gambling sites will actually target a certain group or class in carrying out their promotions, this is a big fat lie bud, atleast, you are wearing a signature ad is belongs to the gambling casino, this means that you are promoting a gambling casino on this forum.
Now, I am going to ask you a very simple question, why do you think that Stake, and several (if not all other online gambling casinos) made it mandatory that as their signature ad campaign participant, you must mandatorily make 10 or more posts in the gambling and gambling discussions board of this forum?
Why do you think that Stake pay you more for each post you make in the gambling and gambling discussion board? While they pay you less for posts you make on other parts and boards on this forum?
The answer to this question is, they made it mandatory that 10 out of 25 posts must be in the gambling and gambling discussion board because, they believe that gamblers are much more active on this board, and those gamblers are the ones they are targeting in their advertisement.
Stake also pays more for every post we make in the gambling and gambling discussion board for exactly same reason, they are targeting all the active gamblers that are actively discussing on this board.
So, gambling sites do have those they are targeting in their promotions, and those they are targeting are always gamblers, real gamblers.