Based on my understanding it is undoubtedly that gambling is haram on their beliefs and we should respect that belief. I am not a Muslim guy but I haven't heard here in our locality wherein they were involved in gambling activities or even online I didn't see one so far. With crypto gambling we really have no idea what religions are involved on there but it is their own decision and risk to do such activities.
Gambling is haram, but people still gamble because they don't see it as haram. After all, according to them, it is a pleasure like any other pleasure. We can't say much about this because it will depend on each person. If they know that gambling is haram but they still gamble often, that's up to them and whatever reasons they say, it still depends on the judgment of those who gamble. We also cannot force them not to gamble because it is haram. After all, that is a decision they have taken and they should be able to take responsibility for it later.