Or people are so fed up with casual forms of entertainment (for example like going to a movie, watch sports game (which stimulates to place a bet), spend time outside) that in the search of new ones, they have stopped at gambling. Because it is both entertainment and a chance to win. When investing is kind of a work. People would rather have fun and might earn, that only might earn. Digitalization has helped a lot to attract more people to gambling also.
I completely agree with some parts of your answer. Going to the cinema, traveling somewhere, spending energy; movement is necessary. However, dozens of casinos that are now available on the Internet do not require any physical effort. All you need is a bottle of beer, some fast food and a deposit, which can be paid right there with a card or crypto. Isn't it entertainment? People have become lazy, but at the same time, their passion for money has not become less. In addition, the American pace of life is quite fast, and anyway, people need spectacles, so they have fun playing in a casino, especially online.