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)