2. Many people take gambling companies as something dirty. People might as well take bitcoin as something dirty too. And bitcoin's decentralized form as a good way to evade authorities and government regulations.
Bitcoin is more powerful than we actually thought. Bitcoin came into the world with an absolute and unreserved liberty and that is why any country or institution that is being chastised by others or the government will have no option than to run to bitcoin for help and survival.
The nature of gambling is such a type that government of some countries prohibits, and there is no how anyone could gamble with the fiat of a country that prohibits gambling.
Then Bitcoin came and gave hope to the gambling industry which resulted to mass adoption of Bitcoin by the gambling industry.
Meanwhile, the statement that "birds of a feather flocks together" is evident here because the nature of gambling and bitcoin is related somehow in terms of risk taking.
That is why the marriage between these two different industries seems to be strong enough and will continue like this as long as both industries last.