Gambling is a general term that unites everything that is associated with gambling. On the Internet - most often online casinos, as well as sports betting. Sometimes you may encounter orders to promote offline casinos, but much less often, because gambling zones are only in some cities and countries.
Betting is often associated with the concept of gambling - it is directly betting on sports. It differs from online casinos in that it is not subject to "random". The winner in this or that tournament can be predicted by various criteria. All these directions are very popular, and associated with huge sums. Of course, you can earn on them and in the field of advertising.

Is it legal?
Betting is completely legal. Bookmakers and sports betting exist absolutely officially, you can even go offline to the appropriate office and place a bet. Another question is that most people are lazy or do not have time to do it. Over the Internet is much faster and more convenient.
With online casinos, everything is not so unambiguous. For example, in Russia, the activities of virtual gambling establishments are prohibited. But only for registration and obtaining a license by the casino itself. For a player who installs an application or goes to the site to make a bet or two, no sanctions will follow.
To advertise online casinos under the law is allowed with some reservations. For example, label the information as 18+. It is forbidden to participate in gambling until the age of majority.
But in general, there are fewer problems than with alcohol or cigarettes.
Where to get the audience from?
"From the street" in online casinos and especially in betting do not come very often. Usually, people who love gambling type in Google and Yandex themselves. Therefore, a lot of "hot" traffic comes.
But sometimes you can also attract those who just like to play. The logic is like this: "I still spend time on virtual entertainment. Maybe I can also make some money on it?"And for the advertiser, this means: you can place offers in game applications. Or on sites that host browser games. Of course, you can't forget about social networks. They may have restrictions: sometimes you can not advertise directly online casinos, but you can use workarounds.

How to get around bans
Yes, many social networks prohibit direct advertising of cash games.And it is easy to get around this, if the casino has a "trial" free period.In fact, most virtual establishments and so offers the player for registration bonuses. This is worth talking about in advertising: say, no money.Everything is free and on "virtual chips".This is not a deception, because the site of the institution itself describes all the conditions in detail. Well, and no one forces anyone to transfer money to the casino account.
Of course, social networks are well aware of such tricks.Tighten not in a hurry, because they too traffic on gambling brings good profits.The main thing here is not to formally violate the law.
In fact, the bans are not so strict. Even Yandex, which bans literally for every slanted glance, does not prohibit information about online casinos, if it is "placed for educational purposes".
What about profits?
The industry is one of the most profitable. People want to have fun, play, bet and win. The only caveat: it is important for someone who is involved in advertising to choose a reliable and quality partner. Do not get involved with suspicious establishments, even if they offer good payment. Scammers - they are scammers. It is unlikely that they will go to jail, but there may be reputational trouble.