Once, slot machines were giant cabinets over 50 feet tall, heavy and bulky on...

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

Once, slot machines were giant cabinets over 50 feet tall, heavy and bulky on the casino floor. Now, those same games fit comfortably on smartphone screens just 6 inches across. This shift means you can spin the reels anywhere without the noise or crowds