Slot machines used to fill casino floors with massive cabinets over 50 feet...

https://celebmeadow.com/from-floor-standing-machines-to-pocket-screens-the-shrinking-footprint-of-slot-games/

Slot machines used to fill casino floors with massive cabinets over 50 feet tall creating a loud, flashy atmosphere. Now you can play similar games on a 6-inch screen right in your pocket