You'll be suprised to know how much those one casino business generate annually if they happen to declear their revenue i don't know if I'll say owners of gambling companies makes more money than the Crypto exchanges but im pretty sure those two are among the top 5 industrial in mordern time and owners of those business have made generational wealth for themselves the anount they made daily is mind blowing.
Casino revenue is increasing steadily because the number of gamblers is increasing too, addiction rate is also increasing, more gamblers becoming in-disciplined just means these casino's earn more. Crypto and online casinos may be amongst the most profitable businesses online, but it is not the most profitable.
Take a look at the communication sector for an example
There are other examples of big businesses that are big benefactors from the digital space, E-commerce and E-commerce websites make massive profits too, maybe the most.