I agree with you OP, because those that are not supposed to start gambling will start gambling in order to win big since, gambling has been legalized, since there's nothing to fear or gamble in secret any more. Non gamblers can be lured to gamble by their friends wins or the ads they see on billboard place on major roads.
Gambling legalization does not mean everyone should freely enter gambling then. People should still consider their financial capacity, if they have extra funds then they can consider gambling sometimes. But if their funds are still tight, its better to just avoid gambling first than fall on the trap due to the belief that they can make instant money with gambling.
However, with social media gambling ads and promotions, and billboards here and there, people will often be lured in gambling, especially those who are jobless and are looking for instant money.
The fact is that poor people prefer to gamble because they hope to win big money from small capital as their hope, because there are so many advertisements circulating about the trick of big wins that are attracted by advertisers as a form of psychological encouragement to generate hope.
Legalization must be with complex rules so that people do not fall further into addiction, such as age restrictions, advertisements showing the wealth obtained from gambling, or any form of flexing so that it is prohibited to be included in this advertisement will be able to help the impact that may occur.