That is why we rarely see most gamblers telling us that they're in the right condition or the actual condition of being in control. Because as you observe those that are actually who have lost already, they're the ones that will tell good things about themselves but trying to avoid the conversation that they're no longer okay. They can't control themselves anymore and they're hyper and hyping themselves just for them to put the conversation into other topic and not focusing on them.
Many gamblers try to hide the real conditions of the losses, but we will eventually find out after we observe his awkward and uninspired behavior. But we shouldn't pressure him to question his condition because he's trying to recover from gambling losses, it's better to invite him to relax in a cafe or other place to relieve stress.
It's better to tell the actual situation to know if he needs more emotional help. They tend to hide it but the real thing is that they need help from someone but they are shy to tell it because they will be judged as they thought.
It is because of this that the first thing that has to be done when it comes to dealing with an addiction is to recognize the you have an addiction, otherwise there is no way to help that person because they are always going to come up with excuses to justify their behavior and somehow try to make it seem rational, but as you say for the people that are not addicted to gambling their behavior is very telling and we can see that they are not in control regardless of their claims, but unfortunately we cannot do anything to help those people until they are willing to help themselves.
Yes, they're the only one that has to work on it so that they'll overcome it. The sad situation for these gamblers is that because of their intensive addiction, like looking in the market is no longer important to them even a huge chunk of their bitcoin investment, they're spending it.