People on bitcointalk (and this goes for all casinos) don't realize that there are many other places that casinos find their players, there is a whole different segment of online world dedicated to gambling and crypto casinos do market their places there as well and that is why we do not see everyone who gambles here also writes here, because they don't, only a few of us write here and gamble at the same time.
So, there could be a lot of people who picked right and can be not from here, and there could be people who got it right AND writes here but didn't want to share his wins. So, there are many reasons why people could get a win or a prize and not share, that is why some casinos have incentives to share peoples big wins (giving them some small free bet for example for sharing).
Yes, you would be surprized how many people I've met that have invested big in Bitcoin and other Cryptos and when I mention if they have a Bitcointalk account they are like "What is bitcointalk"? Bitcointalk is a very good source for anything crypto and gambling related however for some reason people who are new to crypto never seem to be able to find it.
Unfortunately many people these days find gambling sites thru Google or thru some Reddit/Twitter posts and many times they can be a scam site. They deposit their funds and later they have issues with withdraws they google something like "999dice scam" and find Bitcointalk and they read about the scam.
If more people just did their research before sending their precious Bitcoins to a gambling site it would lead to much less scams. Bitcointalk is the best source because if you look at the Fortunejack thread there are over 7000 posts over 360 pages, so you very well know you won't get scammed. Same for the other sites. However if a gambling site is a scam or has shady practises then you can easily find out by reading a few pages here and there. However most people don't take the time to do the research.
This is actually the same story when it comes to people who buy cars. They buy some car, drive it for a while, then it has some issue, they take it to a mechanic and mechnaic basically says "Yes this car is a lemon, why did you buy it", they bought it because it was cheap and they didn't take the time to do research beforehand.