It is necessary always to remember that casino was created to earn money by casino. And first of all earn money casino, only after that earn money players. If you want to earn money it is necessary to trade Forex, but not play casino. Casino is a game - an entertaiment.
Now cryptocurrency market falls and many investors and traders lost so much money that impossilble to loose in casino. During the fall of the market casino becomes more profitable than Forex and you play in casino with pleasure.
Exactly we can't replace gambling with trading even though their both have similar risk level but then the two are different in operational manner and reason.
While forex trading is done with the sole aim of making profits, gambling on the other hand have dual purposes.
Gambling is done for the entertainment of it and as an enjoyable activity and at the same time gambling can be done for the profit making that is why some players take it as a passive income method but with high risk though.