This wasn’t as general as many people think:

1. It applied only to “axillary games” so anything using the primary engine was e.g. running in the fog for assassins creed or practicing moves in a combat game.
2. It applied only to US ans Japan so anywhere else was unrestricted. The entire PAL region was unaffected.
3. The patent was held by Namco / Bandai Namco, they are a prolific publisher but made very limited use of there ability to use loading screen mini games freely.
4. The patent expired in 2015, despite this very few games have used loading screen mini games since.

patents.google.com/patent/US5718632

I can only conclude that the industry just wasn’t that interested in the idea.