Some falsefully speculates that they won just because they want to pave an ease to those who has been advising them to quit or limits gambling simply because the gambler has been unlucky to win instead he keep betting over and over without a good bankroll management in their gambling carriers.
They basically do this because they feels disturbed and inconveniences of the people's opinions and advices towards the gamblers unprofitable gambling experiences
There is so much peer pressure to fit in. It is like what I was taught in my psychology class about in group and out group. And I know that these are the folks with a high propensity to be addicted to gambling.
This is also a part why people don't progress in life, when you confuse yourself that you have gotten to a higher post or level you will start relaxing, in your fake made up world, as crazy as it sounds, there are many people that have done this.
And the truth is, for a problem to be solved you first have to accept that you have the problem, and secondly, for you to get rid of the problem, you need to put in the work, so imagine someone who have income problem faking it, saying to himself that he is rich, with nothing? Such people will never get anything done.
Indeed, it is not surprising that people could fake and lie not only in the gambling industry but in many things as well. Some people are actually cruel, they really deceive people by telling them information that they haven't even experienced yet just for them to try it at their own risk. Not only that you are lying to your friends, family, partner, etc. but also to yourself cause you are building that reputation which is a fake, just imagine them finding out that you did not really win any sht and it will backfire on you. I think one of the reasons that people do this kind of thing is just to feel comfort that they are already a big person to others. Which I think a worse thing to use to escape reality.