Gambling and trading platforms use two completely different business models to keep their companies and their pockets full of money.
When we talk about casinos it is the house (a big accumulation of money and wealth) versus the luck of gamblers, the owners of the casino benefit from statistics and the edge set by the house itself from the beginning, the more each gambler play on the website the more likely is for the house to be profitable and earn money.

On the other hand, exchanges and brokers are different they benefit from the volume because they charge a small fee for allowing their customers to have access to the market liquidity, it does not matter for the broker if traders lose or win, as long as there is volume, they win. The casino owners cannot say the same, as the idea behind the casino is for the house always to win and gamblers to have fun/ thrill out their sessions.

In a casino you can only gamble. On a exchange you can trade, but if you go straight for futures market and use leverage then you would have already crossed the line of trading and stepped into gambling territory.