Online slots expanded from basic classic reels to diverse video themes...

https://extra-wiki.win/index.php/Mechanical_Slots_vs_Online_Slots:_What_Changed_Behind_the_Scenes

Online slots expanded from basic classic reels to diverse video themes featuring immersive graphics and sound. Developers added bonus rounds, Megaways mechanics with thousands of ways to win, jackpots, and Slingo-style hybrids for variety