I found some clear explanations while reading https://iqrabari.com/rulings-on-casino-gambling-in-islam/ about the Islamic view on online casino gambling. The ruling is quite definitive that casino gambling, including online platforms offering poker, roulette, slots, and blackjack, is considered haram in Islam. The reason lies mainly in the fact that gambling is identified as the work of Satan in the Quran, especially highlighted in Surah Al-Ma’idah (5:90-91). These verses emphasize that gambling leads to enmity, hatred, and distracts people from remembering Allah and performing prayers. Alongside its spiritual harms, there’s also the point that the vast majority of gamblers lose money while the companies controlling these games profit heavily, causing economic imbalance and social damage. Even with the technical convenience of online gambling apps now, the fundamental prohibition remains the same because the elements of gambling — betting money and the risk of loss — still exist. This resource shows that Islamic scholars across different traditions unanimously agree on forbidding all forms of casino gambling without exception.