When we research online, we often find that gambling winnings are considered passive income because they rely on luck and don’t require continuous effort.
This must be written by people who don't understand the term itself. Passive income is something that appears on your account without you having to do anything. Therefore, things where you have to put work to make money, or spend time doing something, are not passive in any way. Passive income is your bank giving you money every month as interest. It's bitcoin appreciating in your cold storage.
A situation where you have to make a bet every single time and risk losing the money is not passive income. It would be if you had a stake in the casino and they'd pay you dividends, but betting is definitely active income.