This wasn’t as general as many people think:
- It applied only to “auxiliary games” so anything using the primary engine was ok e.g. running in the fog for assassins creed or practicing moves in a combat game.
- It applied only to US and Japan so anywhere else was unrestricted. The entire PAL region was unaffected.
But also:
- The patent was held by Namco / Bandai Namco, they are a prolific publisher but made very limited use of their ability to use loading screen mini games freely.
- The patent expired in 2015, despite this very few games have used loading screen mini games since.
https://patents.google.com/patent/US5718632
I can only conclude that the industry just wasn’t that interested in the idea.
https://www.visualcapitalist.com/music-industry-revenues-by-format/
Nothing has been as big as CDs but total revenue has been growing since 2015.