This is actually super interesting because they have. In China they allowed Nvidia to ship a Wii emulator on the Shield.

https://www.nintendolife.com/news/2021/08/nvidia_shield_shut...

What is really wild to me is that they could 100% ship Zelda for iOS and make a killing. The Switch has absolutely nothing on a modern iPhone/iPad, even heatsoaked and it would immediately be the best game on iOS.