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Gambling addiction depends only on the actions of each individual and not on where they gamble in a land-based casino or online. Online casinos provide a faster and more convenient form to fulfill one's needs. Whether a gambler will use this to reinforce their addiction is up to them.
In some countries people do not have the opportunity to gamble online and such people are more than 30% of the world's population, but some of them still become gambling addicts. So it's not about where we gamble, but whether we let our desires cloud our minds.