Game-key cards are different from regular game cards, because they don’t contain the full game data. Instead, the game-key card is your “key” to downloading the full game to your system via the internet.
Pay a premium for a physical copy of your game, and the cartridge may not contain the actual game. Only on Nintendo Switch 2.
Oh gross, that’s enough to end the retro market entirely. When the Switch 2 retires, the entire used game trade goes with it.
You know, unless hShop picks it up.