If you have a Nintendo game on a Nintendo console, that game will continue to work on that console as long as it still physically functions.

If Nintendo goes bankrupt, my game boy, 3DS, GameCube, Nintendo 64, and switch will all still work pretty much as if nothing has changed.

Unlike moxie or that Spotify car thing.

You’re describing a different issue entirely around games preservation outside of official Nintendo channels (emulators and roms)

Both can be true that Nintendo does well at sunsetting services to ensure they work as well as they can for as long as possible while still being complete jerks about making sure you can only play that game in that specific way and if you want to play it any other they try to force you to buy the same game over and over.

Nintendo could do away with emulation all together by requiring games to always ping Nintendo servers in startup, or they won’t run.

They could include any number of DRM strategies to prevent emulation at the cost of longevity of their software and hardware.

They don’t, though. They opt for litigation over really strong DRM.