Crypto casinos let you play using digital currencies, giving you full control...

https://wiki-stock.win/index.php/Why_Can_My_Bitcoin_Balance_Change_Even_If_I_Do_Not_Play_Any_Games%3F

Crypto casinos let you play using digital currencies, giving you full control over your wallet and private keys. Traditional online casinos use regular money, where your balance stays fixed, like £20 stays £20