Investing and gambling both involve risk, but they play by different rules....

https://wiki-square.win/index.php/Why_Casinos_Say_Adults_Only_and_What_That_Implies_About_the_Product

Investing and gambling both involve risk, but they play by different rules. Casinos openly show their expected return, so you know the game’s edge upfront. In contrast, many trading products hide their true costs, making long-term gains trickier to spot