First in my own opinion why bitcoin gambling is so successful industry is because lots of people who are using fiat currency and going into physical gambling just to play and now they knew about bitcoin has its more higher value than there using and now tey all play for the sake of the profit and never knew about the risk about it. Since they always playing everyday to earn money.,
In my opinion this industry is so popular and successful because everyone in this world wants the shortest way to earn money in a less time and for that gambling is the only way. Lose or win, depends upon the luck. Many people in this world and I am one of them try their luck in gambling and many people I have seen have become millionaire in minutes because of the good luck and skills in gambling.