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In reality gambling has its positives and negatives aspects if it disclosed to others. Among the downsides are the gamblers they may be criticized by others who may be humiliated. Sometimes their own decisions may be hindered. But the good side is that if a gambler shares his gambling with whom he can get good suggestions which can help him to win in gambling or get the right solution if he has any addiction like you mentioned. I think a gambler should share his gambling with a trusted person. In this case, it can be someone from your own family or some other relatives or friends.
In fact, in certain countries or cities, gambling is judged only from the bad side, such as addiction, acting evilly to get money to gamble, robbing, stealing, etc. this is the reason why a gambler wants to hide his gambling activities because he does not want to be seen as someone who is bad just because he does the activity gambling and on the one hand there are still many reasons why someone hides their gambling activities and one of them is because they are in a Muslim area where gambling is considered haram as some people here say and I agree with you that even though hiding their gambling activities is not a problem but at least tell some people such as family or partner to be on guard if at any time the loss of control is indicated to be a little close to addictive behavior and the person beside you can help you without other people knowing.