Although not scientifically proven, I notice that some of my friends who fall into certain zodiac signs are prone to gambling, and upon checking the zodiac signs, yes, they do bear that sign.
I have two friends who are Aries, and they are hooked on gambling because, based on their Zodiac signs, they are adventurous and impulsive.
And I know three people who are all Geminis, and based on their signs, they are susceptible to gambling because they are too impulsive and love being curious.
Many of us are not fans of Astrology. Is this a coincidence, an exception, or a fact, because there is truth in what astrology is stating, I also have a friend who is a Virgo he is not into gambling and want to stay away with, and based on his zodiac sign he is not prone to gambling because of his being practical
If you believe in magic, significance of zodiac signs or premonitions, you will notice connections that enforce your belief. That's called confirmation bias.
Why isn't it proven scientifically? Because there's no other connection but bias of believers.
This standup summarizes the issue pretty well